Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfa3cb1e9aa5ec4…

MALICIOUS

PDF

123.8 KB Created: 2021-08-09 20:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 894402c4cbbe029a7753e5722c701ef6 SHA-1: 096d918673c82a3adb2b07ce73817843a21d7409 SHA-256: abfa3cb1e9aa5ec4d317bb84c48905c88934479da7f00144e63b22cfaf6ae208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=exercices+corrig%C3%A9s+division+euclidienne+6%C3%A8me+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99a60f40e---8718559478.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900e575c477---68051936865.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bojunaw.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/videronejokevufelasike.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xefibeforanemabejag.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998a490ab66---16651492951.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627907936.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d6ba97bc0b69f9688611c3eb6893baa6/33816106803.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160708c3097093---58630118000.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/6715765788.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090116edcfb8---nugesagaseniwefipatovinen.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/133d33cef39d104208710cc8dd50fad8/98551842899.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/sujelipunusosa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608808be46ee8---90959103303.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/57950341739.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/subusosonevuna.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mexatixawujekuxovulilu.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/b1cbee974409ef7df137a5b8697e0d50/25366638696.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rokulevedegeba.pdfIn PDF document text
    • https://tekartltd.com/upload/files/sopabigubujuxu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160740d39b0acc---64718705238.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e372916411a27eeb93461bd2261540ad/20470948898.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015925.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15925 29304 bytes
SHA-256: 994a21e30d7ce993bd8e48b33069ae819788c1a2f0e734998308a792a7b5562a
font_00_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D40 22256 bytes
SHA-256: c389ae48a1d0a1338c2c06d68f3b1771136076c175771350e1d9bb6bf8220d02
font_03_sfnt_off0001c3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3B3 11432 bytes
SHA-256: 14bb4af929bf589ec9a0b32df766b299298265902c5357170473c2b069ca213e

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