Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e38374822cab711…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 12:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a98e7d4b71459c00f497288b9dcb47bd SHA-1: 4389230a70656253991dd1291c005995fd660781 SHA-256: 3e38374822cab711981db35fcdaec5d79865b3f376622ed25f4d4eea8258778f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or callback scam. Heuristics indicate it functions as a link farm pointing to various compromised WordPress sites, likely serving as a lure. The 'SE_CALLBACK_LURE' heuristic specifically suggests the document prompts users to call a number in a context of billing, refund, or security issues, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=jig+fixture+design+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd03ac89---94199563721.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/xufomesepe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cptjounrqi964hvedr71554kc0/nexafuwelibarepokaso.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/26597354685.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2319e5e10---bukov.pdfIn PDF document text
    • http://esistore.de/userfiles/file/famubadevoxeruk.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e69472ce---buvosidaxe.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9dda59c02847ba4cc1b83d4671d9ca63/95466304464.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qt4si9raimlcbpmpbqctu7qtts/73773019998.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d532ac2fa29---mujawedatitaxatopakabeju.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160731a8a586ff---26658063148.pdfPDF link annotation
    • http://186086.com/upload/files/nukewibaj.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160859e7658666---lekufakutazejitade.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b49798168---58628449701.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/43424795982.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/saturomawixeg.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8a173b56a---69655531050.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/57323350817.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xiwofobitapewuw.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9316186f---jefonejidukedugov.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/lejewetegigaba.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c2273733---kamozozewixezixapag.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vibegijakojipuxofup.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5326dafcf3---40074567840.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/99395385384.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_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 16756 bytes
SHA-256: 34510e3cd7afc318ff32e8326ca22e80b937b5746239bcea0164db2fcdc0f0a6
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10536 bytes
SHA-256: 7372c886c023959bd5816188b590239ec3c8873048da9ec143f5217cd6980139
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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