Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac9d8c46de53c3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 10:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2d850fda6153fbc930f9f92adfc3bbb SHA-1: fcb80e84aad54f5314cdd27ebcafdb2a7ba48c41 SHA-256: 2cac9d8c46de53c372d260384c87d89793c22f5b04a9f58ce6c94dbe42c65db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=do+i+have+a+memory+card+in+my+phone PDF link annotation
    • http://confidenzacsapagy.hu/upload/vawiwikovopadelobuforasux.pdfIn PDF document text
    • http://teresachild.com/upload/files/dikutaruwexis.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/83690056289.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/37151584752.pdfIn PDF document text
    • http://terrietanaka.com/library/files/nikimu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c287aee10efc4e257e4bd13a316aac43/47251867421.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140063844bdc---6493304513.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/jixabobomuton.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/86491149408.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/96879495888.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/sabepasafokasowolemaje.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/mumaduwamuruw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6e15c4a4---83764549805.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kepopoxom.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210915_45351.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/46282774073.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/farofijakabeduverelefuru.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a56729244---vogasupekulavezinebimif.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff8896e48---92881084398.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/papefopodenazodufujivu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/95421780786.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/dusopifin.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/92839849084.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/12883766225.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/fuxotanoxax.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2a9cfadd---60403711517.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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 17240 bytes
SHA-256: 0d74de0742da841949482f23aebcb0268aa5c7bd0ca164ef4e8d54f3e6afe1ed
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 10648 bytes
SHA-256: a89c5a4f77684c001950eecdfee38a6f2c1dede22e8d08032ffebdf99ae45130

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