Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa07ffc7004da10…

MALICIOUS

PDF

70.8 KB Created: 2021-07-02 21:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a346091f5ab0a56dcf49b8e43b74dda7 SHA-1: ad6118cb0eaa5ab21c9e23e4e8d97ad7a5f18f9e SHA-256: 1fa07ffc7004da107979011c1e76f006e50f401c5dc8e848b4b7fcb80696cef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=but+for+conditional
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824609b19c3---mufumizokatebox.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/38jg9rf4dmtindjgk6413tcgda/28915235362.pdf
    • http://ahkjt.com/upfile/file/majimurojudusuwinaraweg.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/dazekurutanajafubines.pdf
    • https://ajitcoatings.com/uploads/80907673249.pdf
    • http://teifsepahan.com/files/file/53745692374.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs2p0ig0uqjb2jr8arl485q0cv/67179325264.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a660bc43974---mejawexexigo.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6803bbbfad---zerubojinit.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/c09mda8dp6mpe8qbsj2k9k67u3/21936007795.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8434cec4a4---2365074458.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/51642307386.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/da6fbf9516b5a8ac7a367c4f4ede48e2/wimapetixozavizumapakufax.pdf
    • http://954move.com/clients/4890/File/filavebalenuwukebebub.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/70604802608.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2c61b22fc---41213304222.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/c01i9jl8jfo4mhkngtu46g7fq0/75694716645.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/85336470441.pdf
    • http://hitecds.com/userfiles/file/misibaxip.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b0e6b1b8---vuraxuki.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78f175a8---mutijo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b385125b591---fowodeliwufap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 16792 bytes
font_01_sfnt_off0000d09c.bin
ba6833960ad1e79c6a473ade573dd2fa6771e426ad516d15a18f312cbc9d5f3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 10324 bytes
font_02_sfnt_off0000e7ff.bin
2aecda0cbe2860f7b92f8687b897d2dba9111777fd10c620d4c8c6f8fb98bda9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 15380 bytes