Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf8a16686623055…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 21:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfed4130db52ebf5d1de48284dac05ce SHA-1: 205ce5f5a8a978b7f1a84f0539067dbc56767baa SHA-256: 2bf8a166866230558a14cb33d679c8fd3eadd5cb5af62c51778e6df070aae51d
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. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d17d9e342---12686091411.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6e2517e3c13b91a9d7ea1cb2e2f32ef1/lipigimabum.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8011489f4fba4c0db3b0b32d47ada15a/setedimar.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b51bfd5929687d7495dbd77f4ffce381/bonamu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f3a1e9eb48089b2f1ec747f3b36eadbd/81822687065.pdf
    • http://kingnature.ru/files/files/tizexanajitilovi.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079019d0cfa0---44679746831.pdf
    • http://alexlunacoach.com/img/editor/file/neluvisavinojudikudak.pdf
    • http://alnoorcity.com/userfiles/file/50467036678.pdf
    • http://iltorg.ru/upload/file/91421628691.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7caea4040---vovijuxenupo.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8704a49e2---40946646327.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b20dab584---35513247733.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/03c9f1b121f717bfc12c2ee3b5d5a642/tezisip.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210617_F2E56FD806D82FE0.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fnc6m60esue95napg57v00601f/13461970207.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/amn0o7cvk5ak6ajcir2vp75615/mawematizax.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce71730fd8---miliresifuji.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fcef37b09f993e4a08cf1573aa9559f6/tixunuwojibabaximevuw.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f78d54335c4a1cee0359f1123a6e12fd/fuzorosawiranekukosatu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b6baa68f---risujeverekugexepa.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c690e36542e---91504582349.pdf
    • http://seoulsquare.com/userfiles/file/4590253881.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/892b01475dbe71da2ebfcf31cf02c011/86621485793.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=interview+questions+and+answers+for+the+post+of+hr+executive
    • 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_off0001019b.bin
33b9dc14d29db83af9634c22ac032d9ddb91e91c12ea3a3bb851e06732831ac2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 11120 bytes
font_01_sfnt_off00011b67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 16792 bytes
font_02_sfnt_off00013379.bin
b93b5e6af954e3f5b0fe525800400b75ff6a7d64f8a2f639079f66f71713b0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 17132 bytes