Malicious PDF — malware analysis report

Static analysis result for SHA-256 6666de898192fb85…

MALICIOUS

PDF

101.9 KB Created: 2021-08-25 00:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 196a1566354cefaab27342285e9be221 SHA-1: 7cae58f23f80d690928748ce58981df23f50fed2 SHA-256: 6666de898192fb85d59705785889a45adffa93f8c21189c18bb248dd4f8d4ff0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e2a2e9049b577e3502b6ee3a2c93d6d7/33444619576.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/99809769992.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1be9b9c5e---molijibabotefesene.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/78438113199.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/mesibagujosa.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vapuzuzogapodajogel.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/lomelolomowuxen.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/64591627882.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa30da9cbf---negesazigurilol.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085835b7ea93---mupit.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/81768989379.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbae957bb4---50572129941.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d749763d---noxulo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f82fc0ac028---22545888613.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3410a7fe6d---6926369638.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e861918a0---jevomuvawakefepefuvafe.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kivotuxexivazu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/ziralozu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wimazisobojamoloropifeso.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160cda4be19a9b---fukefaveveginapubixoroki.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3033dbdc24c42af52bf981b64d82503d/wosotawogetugafuvijes.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/hdtooug7lk62vqc7o6md1su0fr/vefuzuvijidopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+square+root+of+196PDF 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_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 10668 bytes
SHA-256: f885e996d362aa8b870ba5ae9b57d54b99044a166315a42eccd9772912c688ea
font_01_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 17784 bytes
SHA-256: 77f10fd7b9d4967347c5229eb897e1ebe2a859d3ba87b6b9747365091439053c
font_02_sfnt_off0001704c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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