Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf36376c161a1f2c…

MALICIOUS

PDF

97.4 KB Created: 2021-07-20 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3449ef10fbf5d0b8cd106cb342c9418 SHA-1: 904dddaf9e8a056928db5cdefbbc3f1c9fc65598 SHA-256: cf36376c161a1f2c4e705067e8600ed82088cc348e32dc5972c3e584c5e8de87
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609d902d81b7f---golob.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4311706e2fa667806db59afdc95810b2/26109510818.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/506d51601696661c256f390c6b7318e5/timinenafesenuretigewojo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/37207239570.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b17638eb---90715007494.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gikijila.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/velajanavamutizulexerirak.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e45b192ce---bowiso.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/gurorakek.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xadiwupanofakowemo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d814512d15d04d0f9a0eff465c3d956a/regizimasoz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/692ee8845e0b767a83f491dda3c9b746/27698388014.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210710112502.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/997jpq4l4tvamdroe1ksatlnhi/murokixodebitejovag.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/kasokorare.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/94384216079.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lageraxusolabazisetiniz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p6ogrf8q7a7fuc6to047h66eg9/riberunoxegixogoxemuxiwu.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///47365700852.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ushjpgog8s42sak24r4j60vap1/68764092082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=renewable+and+non+renewable+sourcesPDF 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_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 17460 bytes
SHA-256: df90cd68aaf77c683cb97e393e13881228586988bd77bbd1b6feec741751e346
font_01_sfnt_off00014823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14823 10544 bytes
SHA-256: d19b05e107f155df4cea7be4ab15899b75f13792125adff1d3df0fb7e232d1b1
font_02_sfnt_off0001605d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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