Malicious PDF — malware analysis report

Static analysis result for SHA-256 856992cc02f56d85…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 03:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 24abc42cfe3ed1722e74fde48555b242 SHA-1: 59ee6aadebed9dc0d9534d094999bc5ec734f7bf SHA-256: 856992cc02f56d8570ca6935773683b5cf19cd56438e27d02f738e738cc6e532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external resources, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the presence of external links and the nature of the lure indicate a likely attempt to download and execute a second-stage payload or to trick the user into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://eminencesolutions.in/resources/userfiles/file/livekasemibisovuzuxidevon.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/foparow.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/7d2e65092685780475c97c1150af3fd4/wuzudepufamatijelonaride.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sanivupadi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/aec439c9000ef6ffe271e02b56eb0e5b/vegetipiwemitokimejalasep.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ac49acedde5926a80efa3f3b4dbd763/fasoxilaxapurog.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0731410c5---lujafufusirozizu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37bb2c656---tikusojoxakatarubova.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2a31a6fa436fb0de43fd3c01dc47b733/28345715214.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/41358527666.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/bejejexixesewovodux.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160891fef2ffcc---21408717919.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/adad3198b99efa101e8f95cdaa96f079/kutazefowomuvupuramadovaw.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/62448032243.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/20714423097.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nozenojepirumijo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/840501b3eb8ae12879077a64af064d02/70522401624.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///fakuwojebafikuda.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///tuferinomatogijivowopifi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/luzizusu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7505643d5ba0f8bb32d6eea494510d13/36204920532.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55dc09c375---88555053966.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5355a455a2---85048848605.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/07b6886749920a69e0f61f8db5649fb1/vurepetadevuv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k8sqe6rkhqards06iqlb0gjjf2/76283427545.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zudefobovokapodosed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=biggest+ftse+250+fallersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 17820 bytes
SHA-256: 75f346bbaaf2dbeb8b4aa3a5cc32327e9e98431af21b5c71be5d210ee87a613c
font_02_sfnt_off00015a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A36 10592 bytes
SHA-256: c678c4a9af8b644d7143d04cb36cb03fbd836541b03cd9dca955b1868088c28d

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