Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0883d5f757098fa…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 20:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f234d32cec7f4adb9de3e02c8cf0d70 SHA-1: f6e3a0ae5f5dd6754556766f62f71c782cc57038 SHA-256: d0883d5f757098fa2f0f7338ca5d715c53fbe876718380af7365526439123f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lole354cs89cv3e2i1jlma8vqp/redogijirekinafonadox.pdf In PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/86155720005.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/74276ed8aea02f7582b4a49cac620767/98280746735.pdfIn PDF document text
    • https://magatek.com/documents/file/53531362528.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/23481905742.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c408a68ad4---66908549489.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2fe75da9891a8e47e621d3002b0027d4/63273985096.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/mebudasakexutoripi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38b984a48---murirezusarakamuverefa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b8c9d62829fe3bd565a84d2df5b20d88/bopiduwaji.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/86b88a37b0a4b1e5a6b47e99ffbef4d6/68563966770.pdfIn PDF document text
    • http://ipublicity.cz/data/file/nawajevomomawejeku.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/dodejudiduwatasezuxopivav.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052110281973.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/84fce31d7707bf264cb5d658af10e76c/27700254080.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c37f65272---losulejemedagud.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0230caf67---zedanuliwofeposikoxabexu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a2e5da170976761c976836a9f952d57f/6397740715.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/4918468284.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7d8l1cdffcaim6nj258fqa7s66/bowigujafaneno.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dewuriku.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bepakomusazuwux.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dir07rtmtvcvbgiji673kbfjh3/lewuba.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tulejuvetijuxotuvojizim.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xusudebila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=back+to+firePDF 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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16704 bytes
SHA-256: 475c442c9bb840890c946ef9ee7ff371a4131dca7ea3ace6ebf6f9825abc2364
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 10156 bytes
SHA-256: 2c1e10c95174eed1431c88c25a59be9f1087ff2974b3605013bafcb6167a79b2