Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa78bf8187322244…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 17:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ea7a3c5898e2a31692e2a8d3e47fb47 SHA-1: 11d5aefd3d10fe27189e03c32862e04d1bfa29df SHA-256: fa78bf818732224478dc18100bfb53ac3c8d73fb51ec8288f047b24da156339d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised WordPress sites and disposable domains, suggest a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=worksheet+simple+past+irregular+verbs PDF link annotation
    • https://fereshtegan.net/basefile/fereshtegannet/files/renovimabu.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/98000126878.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9b53312c5---valavexawutoforij.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0093f2fd35---55420736473.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab954feff96---memuwunegoketidi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/78068592717.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/20793098934.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/72ca1a0ae39836c368a2d3130a6b348c/lapolelovimilugugedoxegog.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6c1b19ef04d5502619e78f427f3df9b8/962638246.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f07de7d6b41868c21d3af07a4b14f2ec/79721090340.pdfIn PDF document text
    • https://jambukuning.com/contents//files/17891435727.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/32031106104.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/relijajokaz.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/wifemelikafenabureli.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/621310d873f01d0295e9c40c78c7501d/72949488065.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/zetuwolativalerawur.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lotagorarapamo.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/39d7285a8f12bd933ae9af711658a8ad/somobapulepufewinokol.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/vugitizabuzilamumag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21fc5dd978---6606806647.pdfIn PDF document text
    • https://qkon.ca/images/file/xuxofuxasenidebifeviguxu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4p4eqn3n4ne0bjmnp6l76r151p/77779303841.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e733559f---salivizanegolovefevi.pdfIn PDF document text
    • https://grancom.by/upload/docs/30323333396.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 16856 bytes
SHA-256: a44905c8f031613eb288aeff8fc38489ac3ff6a501af8bab8f4fcdc423b50eee
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10984 bytes
SHA-256: 7430f8a9e3679e4449b0ce588b7bde95c1870fd8a41f32d8a9790ce47325818d

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