Malicious PDF — malware analysis report

Static analysis result for SHA-256 5715abe63bf4f26d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 11:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60a67fc3eae83b4672d0b76028356c9a SHA-1: 3170bde13a0f80368e3573134a85291ba586ab15 SHA-256: 5715abe63bf4f26d6ce53a0d5499801df4c923a66a9effcd03902e6c6d793bfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdf In PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/26553669434.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/dexowufabemuz.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/52248846058.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/91821077743.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/56206309331.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/42074284510.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/31786520137.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c1d856dd73feecbe6836201601f71503/kinoranofo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355a2a6f2d---99600540898.pdfIn PDF document text
    • http://masonhn.com/d/files/72490640747.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn7k88gb15qnr3efl4obj3fr24/terunalesetirelabovukidad.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/77465448381.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/31886323157.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/095000adad717be3b4704e90506aaa66/buwetopa.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/37502137335.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vomjr9ce1h0jedg2lelciaigr4/wukafojojapudikugugivesa.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/62571390878.pdfIn PDF document text
    • https://camphacement.vn/upload/files/94357759273.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/32681609036.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/18499471784.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=soft+android+free+downloadPDF 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_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 10340 bytes
SHA-256: b852ca666514c07f6f18b46b7636a176089a2d72613f01d207a82889e354e851
font_01_sfnt_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 13924 bytes
SHA-256: db2ad07a30a62c691f351fabe5cdc266f87875f8831c16716a492aad5fe31181