Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf7e57c2cf40906…

MALICIOUS

PDF

72.0 KB Created: 2021-07-13 19:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e2b94eea8aed3a9d52ae294fdb21120 SHA-1: bb51760b2570c0519b5316b44827dc081be15ec9 SHA-256: faf7e57c2cf4090689df890e42b79278be6cf4d171c84dd49324768832bb9cda
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or redirect users to malware. The presence of multiple links to potentially compromised WordPress sites and other suspicious domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://grancom.by/upload/docs/92346661194.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080f78d6187c---10551343547.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/93576234339.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fb4b42e1baa4c5fcf85a37e4f3231245/97267332986.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dfb60dc6---64498580851.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/50274758997.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///jesijofiwoguzakeleritizog.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3fe0da99eb6acb8c7cdd46531a8ea29d/luwivo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jidasoxekadog.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97be87549d---50383192849.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2753e7c9c2---nikadekezexaretijuda.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/99c2fac8f22063a4e01ded46f5a41572/57891933697.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kesufiwekitafez.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4ad90eeef8158d181484e59f36b9694e/83120465900.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/675b59c21d0502eea4e6119e3f7c1275/xowavugatot.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/23896cbc461cb6211d8f58a820d25aa5/20072738721.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b478f9f5---79552048832.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/vubuvubujuwojitovozivuvo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6bb8a8e459071e0ac48ab7ce169de785/8238035476.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/virebodojodog.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080618abc837---37817337994.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/junewuvisojapi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607108c8e6729---31157273726.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71192942f3---tugepizupobakilovidalewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electron+dot+structure+of+h2s+and+f2PDF 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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 15328 bytes
SHA-256: aacd0e86c8e997df91a9b278fcfb82650047e1debc1f7c4f4a8cf9945d7f5ee5
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 10684 bytes
SHA-256: 836f6b8dc848b1e5233748b5af6ed09451dccd5801d3cca012c2bb1e1126c8c6
font_02_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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