Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3fbf60532cc62e…

MALICIOUS

PDF

103.5 KB Created: 2021-09-06 04:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fe31cd4cc2a9330ec065d277cb1caf2 SHA-1: 4f0afe643f9a8a606521f14bb49a7a898e94cab0 SHA-256: 5c3fbf60532cc62e68c8fe1500c4775e5efc9b0a1b8333a2ff7e05d3714bf31b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the exploitation of user trust through the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://onlinendttraining.net/files/37874572736.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770fcf36e1a---pafimeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3718ae85---dupokorizojowusomuseki.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/32405566551.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8188504d---30147732425.pdfIn PDF document text
    • https://heyratacademy.ir/file/80385916873.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f21394b2f400408c8656fce6fa2464fb/pekerupewasixexavamozo.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/temisexizalijizukoj.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c324d1603---83977032958.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/kalevelapilonuja.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1f8601e8ea823cea4d4b085fbca5343c/46712502248.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd795ddb54---nazirovegir.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/85826532694.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26463643294.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c9445bd194483f0cc86cff7488166abe/jeroguvenegena.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/tafexoxerilalason.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bljf8cj4pndbhrssoijl17ob30/90935397746.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/265edcd62c04a6a0d806c50c4581b36b/17187404006.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff34b7a4---96974820892.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/94414588166.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/kupirixumuj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/19d926197b70e70c391ffaa876f35dbd/bevopabekib.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/69623338677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ambulance+man+badge+notes+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_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 19124 bytes
SHA-256: 299e9e0ea3eb1cd78a18e4bb1fe837109a064d0a72e2a738ab175a52a2169b0e
font_01_sfnt_off00015ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 10992 bytes
SHA-256: 4c6826f8d9368c2f1a9bf92a405e776c576f3ef9abf9ac2227e4ada63ddb2e58
font_02_sfnt_off0001781e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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