Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24ff3feeb927099…

MALICIOUS

PDF

71.2 KB Created: 2021-07-09 02:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd32fa0fa46501b1b99eaf80cc549f19 SHA-1: 3b02a41a3730e6f2f0ac3586cecae09216cf4a70 SHA-256: f24ff3feeb9270993ea27ba78a937dc32cdca0489aefbc5f79b8aaea57eae9ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=bcd+to+7+segment+decoder+vhdl PDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/993fb56b702c03466de63c5aa502a4eb/58445344826.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/38016596183.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xosilokat.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/14924541625.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bc023f8aad6---58029642072.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b0a6ea8ad6f0c1e31e18656405e20dc0/belukonenawekixil.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609010a9e14ca---75369879022.pdfIn PDF document text
    • https://argumentua.com/i/file/1901865836.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094136276e93---daperazubupimebumenofud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f070c588fd---83717483828.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41be69016---13562755049.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1e67c6da---35512285112.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc03d538e0---wekovewefadasekexebu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/wotadasurotilajelimofixa.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec685213ce---26532316094.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/98560236100.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/48617551018.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a15cb7f9c75d12dc21946cb0b6d8f45c/funipew.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9ad13e36f9c1b7162a5e348f8eb026f8/77687167524.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/94809136780.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a8728f6e9801900bc59e0b3fbce87b0a/33853988374.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 16084 bytes
SHA-256: 9ee66b24037fb554d5c6a5ec5eb13cdb49a9cd8a490c7a7aadb8282cde1c7fe4
font_02_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 10732 bytes
SHA-256: bab6e1436af0473ff4b380dde9f42aa2c963e04d84d08db4e8535b3266f70350

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