Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ca8ce543248b0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 19:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 56530ea9993047a46904012a80ac4080 SHA-1: 7cb80953e202addfc932264ac25c33ec0b7a4e20 SHA-256: f54ca8ce543248b0c2d84233709c35994dc847eee98e2d86a1d1723a7c9d8a67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a callback phishing or tech-support scam. It contains multiple URLs pointing to potentially compromised websites and uses a link farm pattern. The heuristic 'SE_CALLBACK_LURE' specifically indicates that the document prompts the user to call a phone number in a context related to billing, refunds, or security, which is a common social engineering tactic. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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://ed-union05.ru/files/file/nomenoragorudadagozobivar.pdf In PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/wokakuliwemafiwape.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ac8df79d---14835205838.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/94df3itrmc5ik2jl577dstii60/36393232888.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/gebegupegupi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3d90eaaecc875d1fc8928a0ec62d8ea8/10988068744.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/60278935839.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/kamasevobiz.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/40818274335.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b08c116f---11867885589.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/lifajitajelex.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78fb8c0ed9---lofezilal.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/venajikabof.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kaleged.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/65414915335.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/feberiz.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/93074045404.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/48814609874.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4dc0692e2---polerapaxefurinabo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160747930c4548---razoruvu.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/21bb8576c7174466239e0780a523bad4/tigam.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802dd7886c1---9654343995.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/54de0236ab63e627428e95c49761d27f/80579242360.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930af5d730---99141317429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=marine+diesel+engines+nigel+calder+pdfPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 19532 bytes
SHA-256: 980e727d6bd8bc9c625b0d3b706ae512c383a5e3b85f2385f16a55d99ff7f083
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10568 bytes
SHA-256: f88f692f1c6de0260e56fe0a31ad2b19f01c35757a57847e3c2f0bdd6e0a6711
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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