Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d742cb02e85923a…

MALICIOUS

PDF

97.5 KB Created: 2021-09-03 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26f3c8aa35f7829fecfdba2511d3f2df SHA-1: a9c046e8f9c28e69f38030757d6cc2c6ed61ac30 SHA-256: 2d742cb02e85923aace57783578809809411d814cfc8d4a1f088e39fbc053fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple compromised websites, many of which are WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The presence of numerous links to potentially compromised CMS upload directories suggests a tactic to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abf69bd5d3f---tunodeveken.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/379497381673ad087d2f06af64e66f4b/14309036120.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/89898728166.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/83192529466.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde810fbc1---62697638811.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92762d113---zurojegulenufefa.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/75384752189.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0ea80d03140a1ba2dd5261b17bfddf85/57934446053.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/lenipejarefoxidokiwepufe.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/93076155612.pdfIn PDF document text
    • http://mobilenmr.com/files/files/47630553126.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/67010536543.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ea0b64a8c9e87f3abc801e4639c26e49/vazafexemifovepaga.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/14634571553.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8afb7f4f---zinovaba.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zikutukurunitojo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dthn7bmk9uh6aialhp2n540230/67913781322.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/43924803998.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/ludobevasorojelawibekor.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/82373414942.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/15701867576.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4c1ea80ce4358f7b828ecc3a185293d6/12730935894.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73980919814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dictionnaire+anglais+technique+pdfPDF 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_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 11148 bytes
SHA-256: b82048bfccdfd29ff252f0ab16e30cfbad5dc108168e63c11e57953dad470bbf
font_02_sfnt_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 23356 bytes
SHA-256: 4c6cc2e637403a53af80b8904d0d948e782f68f27d5c5b586ca8c9f5520c4f46

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