Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad2d69adaa2287c…

MALICIOUS

PDF

91.3 KB Created: 2021-07-15 21:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b833f6aeeb27f26e81947534b109f8fc SHA-1: 5c2f81b34ba3757c289ce3f7f9f7a1fd7de6740d SHA-256: 4ad2d69adaa2287c228ee735365bdd05a30ec65982ed50aa1554f566a5654b9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=malayalam+short+stories+by+famous+writers PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fec0d17655b849bf53c8223a90a7789d/84038475094.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc4dedfe---batozukeseso.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fef1be9e---negifabaner.pdfIn PDF document text
    • http://mesterek.net/tmp/fowijibikariti.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1bbcaa08---fubapek.pdfIn PDF document text
    • https://proxus.nl/file/jofepavokalomewotepa.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/65061541773.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • http://tele-video.ru/upload/files/57359860290.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fbf72127fc692f47dbe14ec8a37a4e47/99699147005.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wanux.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4f9c8b09417413f39a066c3672e7b57f/20707099367.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/18695105727.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee3b3df2a---87980334256.pdfIn PDF document text
    • http://beiks.info/public/file/84531652751.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/abkg9etfs070ve6rhgqqb8k6aa/daxubafozotenesunewosebu.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/lozopadaranub.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/50710362618.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bf7b6124562eb81f3186fecefe8aa4a4/nalerubelonanojuto.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/werumevofomoxu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3e4215f77c5417aa185ab752e74e8ab/tulidusifotika.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/47a24c94d2af00d319ac6c8752e23c39/wogepomesin.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10808 bytes
SHA-256: f6f695f5f4bfe8b7340461c08701ff917776fba59fdd267ff4dfc34f3d1145b9
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 17304 bytes
SHA-256: 9b503aed2f2beca721992ea302779e8c4ba8ff5d1cc8967232e94fc17251fbe1
font_02_sfnt_off000147fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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