Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b8d0ac85037fc4…

MALICIOUS

PDF

78.0 KB Created: 2021-05-10 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 08d7775ad01eefb2768704992998de8d SHA-1: 134eea4a7ba913d9bd5f3864f981ca25f41452c8 SHA-256: 64b8d0ac85037fc4935a3485a9fe914bd69964f86e95a6defab4babbc9fba459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8ba0a0f6866a930860f590d8eb9a725d/linokugazoj.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mcp5lrfojq6q0t0m2c9v1h1h40/34317387072.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ck5mkpopv1c40lfr9p0vco39j0/saxugadibulizunalofot.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1p7smn9q1ot5qfhkd426pgs1ik/pogixoxubulovavefov.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23ab026da---nitusufisorimovetomunopuw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fdeb0b2c---2281627680.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/032b79a5fa7ebce7ee91569abd0428c0/rixopo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/89eb9f639a28cf2ac5449ab0f5c17390/40117645397.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/da1fc5a57df692bccbc764be32eea87b/87431273050.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bd24e12e---ruwugixisivosakesidu.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a0c5981c---gezunivunuvatamo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/dc8675c1fea0af9de3806507fcc9c9c9/rupavuzapoloponuja.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rbu24o079l6sm3710mektncm09/52880109771.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0b483510---wajixuxi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/purevezupilofidu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070c338be148---57120926766.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608890419a01e---63918671327.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wawuranupodixufure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bonjour+mon+ami+font+freePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 3240 bytes
SHA-256: acf35959e0816f296bafd4068538785282df6ab34eed7255e710c443b48be1d2
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 4828 bytes
SHA-256: d550623ffc52538f023c93fa7aab2735bf3e75a202f3885338b681cf171160e0
font_02_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 14304 bytes
SHA-256: c4c818786a70969425af285ff7cb2419d188f059d454ee53827ccaddaefc0c25
font_03_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16108 bytes
SHA-256: 2906e013a2c12f8438753706de5a20d0a45d34478d649377d82f29cc76ae0543

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