Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6137ab53cd442f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 15:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00a95f5175010886637b4c9934a0b480 SHA-1: 724ed4dcdab338c368fba2c2c74881514d074e5e SHA-256: 2f6137ab53cd442fcaec735d9577071859591ac6c9420d9f284d5faf2df6d4ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=cobra+18+plus+cb+radio+manual PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/q87d0d4qn0kfbh3l7ova8gbi35/97208989580.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wifevatipekom.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/18125107260.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rvc996i3fak3c8vnts7guuispr/36025510630.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866320ce0a9---guvizaduwevatubabisu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dc7aotq7ibl0gd2m40tp5l82f1/31842723204.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/pemuwokoloparugo.pdfIn PDF document text
    • http://minhanh.com/files/42311387303.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/nexotadugodorijewarejusi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/94846760619.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/wemowalajesajifipurezewak.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcb67a0f1---89824825650.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/jafotoxur.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/74415943451.pdfIn PDF document text
    • http://jp-cable.com/d/files/89907088334.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1243349168609ba8c49b55a.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ac7r173csr1rntlugs7b4tb98s/bedisa.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4f589839269739131c19c1220e3d3c7c/dakavorobiliba.pdfIn PDF document text
    • http://ud2-140.com/files/46394886286.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sowilagife.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/sirerigora.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d9b0ad00add.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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 15268 bytes
SHA-256: 95e600f9ef4114b40b2b3283d8341301a544955ae4053a1e5b00d5edbf54985c
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 10976 bytes
SHA-256: 51c97dc488b1ccc69b15990765807a30334a26b3c1275e1d9eabafda8a49d22b
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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