Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ea1df0bdf82a3…

MALICIOUS

PDF

96.2 KB Created: 2021-07-02 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7a150be6a1452f60955ccc6801e6c59 SHA-1: d8c9a77669dfde38827ba1533a4069ee4be4e6f0 SHA-256: a55ea1df0bdf82a3eb0aa9adbc3f61801135636df021fc889095638aa9c71cba
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which appear to be WordPress installations hosting malicious PDFs. The sample's structure suggests it is a link farm designed to redirect users to these compromised sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ae22c9c4609da017006ceeb3f018a2d4/7338842620.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd97fddd50---37983041167.pdfPDF link annotation
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pvb917cim02kjp7bhvglk0iq53/womubirarolatipo.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/74965250621.pdfIn PDF document text
    • http://deauville.ru/files/file/xojuvukuxe.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef61080e9e---72131577068.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/30578944265.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vtt3brf1ptfs62slrlc32veom6/31418871613.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bc4b2bee---67261784700.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/mufikefurelaked.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bccf992842feb1cfac0e6e84db3bc43a/56608265536.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6ff3c52d---90528339396.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/31530455021.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608463a2aa775---53834551926.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea5262412---tirabisal.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6b0dfb48---zajosopobanirowoxesarojun.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/batobiduz.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/48094655073.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a293f077f4d---webowetogegifizox.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/62cb7f32f0ba5c04222de423ee4272a7/lalugovo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52bd8f978b2e64b10ffe0b369c522f2a/jamaneg.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hdlhbme5sk4dnchjl6outd6uo7/43993919484.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089616bb0fc1---74742769959.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/81f79aa85ead696891c9a63645ee4736/xunurutokebugegidazefewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=own+house+line+in+palmistryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 10844 bytes
SHA-256: 1fa8435e77cfdf9aaacb10c5ce72f2ece4d5278d068b1658b135d7b78a101081
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 17528 bytes
SHA-256: c8a0e31474712a16394d40ca1cfbf9ae961e4b2201eb38be2f8926d2fea41b83
font_03_sfnt_off000163b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B2 4040 bytes
SHA-256: b4bc8bd1bc0dcec798809f70645822c95f2159952b085d5f3b1ec2509c57bb7d

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