Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e80cffe3e6e28d…

MALICIOUS

PDF

97.6 KB Created: 2021-08-18 16:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 730e6397123721cbf32a8930d82983d8 SHA-1: 990bbf3827c378bb083f4769a89cc34412f20ee8 SHA-256: 77e80cffe3e6e28d87e3745dae0f0c9e96f9e46414defa42bf7ca2df08444505
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to potentially compromised websites, with one specifically pointing to a PDF hosted on a WordPress upload directory. The document body, though heavily obfuscated, suggests a lure related to billing, refunds, or security issues, prompting users to call a number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://absolutelyneon.com/userfiles/file/90262038482.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/koxelipo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95616238120.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ecqo2u6aas3uu8gnbel7dircv2/xifijowevafepupovab.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607868f669461---zusarivonivegekopusalako.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/djib3bv15s7haij546kmclr42i/31521927113.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077151ccedc9---fagetewo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/86711852278.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/51b0a854a3689c7be17d6dae767b08d7/66306386606.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/tituvipimogawiropoturam.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b03e513a3---pijovujemikor.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/musebikujazunovexolokutim.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/litebif.pdfIn PDF document text
    • http://azizolace.cz/images/file/dodusanevolexa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/fonuvijabiron.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/galiwu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d60e086af72b8b6c1fa39a8a591adf/zuxeni.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85cb11d2da---vodetepiponagudewexajute.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/380ed9db7412ab75f31373e60bede596/6817207946.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/sisagumuvabebumibepi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/55724d360cd3b37481e69f726fc1a8ca/28594553798.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84ffaadaaefdde3dca480b058da74e70/zivuxibibapujevuxoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cancel+my+dmv+appointmentPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f2318459235838d37d24a49844c81520/14438750035.pdfIn PDF document text
    • 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_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 17556 bytes
SHA-256: 6483ec11792ca8945a3cdef336eefb8901008a066d0b95032517aedea715fb67
font_01_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBF 10664 bytes
SHA-256: 511ee135b73d90f9b23eb4e565659211f3c9dac509be30400200ce4da086785d

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