Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fe6371f7d936ac…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 11:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8a3a29745fdc6e70edce30e563bc147 SHA-1: d2bc7a06d766ca6550303e4c49042da647ede2c4 SHA-256: b7fe6371f7d936ac9bd5c143d57ef5692abea034d089538abdde024dadc0e683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=elastomero+de+silicone+pdf PDF link annotation
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207fe32947c---87107874160.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/judigepavidifiwidolimuvo.pdfIn PDF document text
    • https://airshow-bg.com/file/58873718948.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/sutunaderunugibubulavonu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9cc2a52a---48099890329.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/rutipamodujojib.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5698b013e6---bigizevewufuji.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a87457e8---56025816987.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/tisikomorel.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8tvqpk8uo1mpiiu4d4kivunvka/suxujopupijozopolizazopo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5027058179.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/59145329265.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/losuxowagovex.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210608045344220.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/68280938033.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vodatutekebosamataf.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797af4e357f---40802254438.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/nefevasobusinonukimaxav.pdfIn PDF document text
    • http://greenld.com/userfiles/fodeso.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b427aef3aa---37118205154.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608793def2d33---tumodatekikixejubexaf.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/18571166886.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_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 19032 bytes
SHA-256: e831bce37011566545ea3f3d0efb29ed104ba5fbebd9d8c72e6e291356d8740a
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 10764 bytes
SHA-256: dc97cd6319c7f1e2fb7530b7591295d3782130c5f444816925086774453f89b0

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