Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8881ed1f73e176c…

MALICIOUS

PDF

93.0 KB Created: 2021-07-27 22:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6aaa0a8b71123b7983e6802e13300b3b SHA-1: b3c0544c6385fcb68d3f73439f67fdd35137fe2e SHA-256: a8881ed1f73e176c1cf9cf74e50f72ceef5b68468d6d99277f9a4f0c177e54ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://agcslohian.com/userfiles/file/73421050691.pdf In PDF document text
    • https://gancza-yacht.pl/userfiles/file/bexezagebup.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/62540362633.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6802795c64bec2ad06308f4c4de84936/lipasezoniloposuj.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/72584826149.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/29086575349.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/zivalelejo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094068ce6892---85880464100.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca9d02522---64303270961.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2e518430---34632042541.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b11b065d---vofivanigikotenekizo.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/42903cb2cbea3c18c2a1af1b8f77a283/refabo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae6ac606---mufinilinusapefizajuvu.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/ribalironafezamonukaj.pdfIn PDF document text
    • http://www.toptehnik.si/images/mumugolepimajap.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210714152513.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wesekokebiliv.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/41853908640.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/jixuboz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/77613c783df58d985ab10c142efdf671/85689881967.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dnhg5m5f1veqvbj8marupukeq7/13543651927.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/xeduxegexabu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d211b6d2e5---30278274962.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/85415361954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sony+vegas+pro+14+serial+number+generatorPDF 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_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 11220 bytes
SHA-256: 9d9ffbb574c7d943fbf93b53562a2747ed2b798584b77174d1005d62dea5e801
font_01_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 17408 bytes
SHA-256: 6289679c3e4f4a3bda4786061bfb371b54232bdd203737885e3d22fc3ce9885c
font_02_sfnt_off00014d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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