Malicious PDF — malware analysis report

Static analysis result for SHA-256 50172f8b692a65b9…

MALICIOUS

PDF

104.0 KB Created: 2021-09-03 14:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9549cc72414fd44c8b0d9607c63e9309 SHA-1: 70dfca25f43bccc0b5b9d698605b34a43baabea0 SHA-256: 50172f8b692a65b9ad375e2ac8e0f2eaf96f59350266c7cb8e0f1d57e5e28c98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised websites, suggesting an attempt to host and distribute malicious content. The presence of a 'callback phishing phone lure' heuristic further supports the phishing intent, aiming to trick users into contacting a fraudulent support line.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc851f2ba---wububikizet.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610339f48b3be---74910236091.pdfIn PDF document text
    • http://kd-council.com/upfile/files/75175819315.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da951b8ea---tafasapubamujasetewafoji.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/rixanoja.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/85676347805.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa60597a7---67807273559.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f609666a3fa---puwanebapekajun.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611fceea9ef65---62911188542.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f9097560aacbba3d204068508612f112/11327747992.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210630210927.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/wajumulaviterivufinomo.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/45492831892.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/gexuxuk.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/41400721469.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198e22ecd0---38876825333.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/dalotoduladapepu.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kuwolu.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/mepuxaribakimebo.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/96989234560.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/rupikofo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ed0b7033d---99633701433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=jlab+earbuds+instruction+manualPDF 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_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 20640 bytes
SHA-256: 317213040fd4f09b134e06d8d5e35e8885f675df05138d23f88e2ae00c94fc02
font_02_sfnt_off000179c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C4 10760 bytes
SHA-256: ba647f2ea49ce077c288546b69930b8c8fe5c931766ae0b3dbb1c771c19f794d

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