Malicious PDF — malware analysis report

Static analysis result for SHA-256 914866ae214cee5f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 00:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fe1e52f78979d3267b29f0692f2ca2a SHA-1: 86752e38a9977b0c485034be8a744c5701d622e4 SHA-256: 914866ae214cee5fc9d587597b2e749c530c8f6300138b5edb0938ac4a185b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/46835bb66e352053a75040da98c1aef0/69516696739.pdf In PDF document text
    • http://dispensapertutti.com/userfiles/files/57853618529.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/davupag.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ihqv793bviglica2uj5qol1q31/fupemufuvoka.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/81800399661.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0944e66nm5ocn6gdh30nupsh67/42022588459.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140737c9292c---42720267816.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/59037260083.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/71533536503.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/9856405284.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/29755603010.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/somaketivodinawol.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210927154953.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vakeweposarizufomekug.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/sezodeliwufekagona.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/ronowidegapemuz.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/33816555804.pdfIn PDF document text
    • https://basisnomor.com/contents/files/kifuwujemesuxawum.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/65767197022.pdfIn PDF document text
    • http://full814.com/upload/files/54038313252.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/26604009290.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/sodepitilenopesejozabave.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/kulad.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/374ca4321776fc642fc673f19d8f3554/81515782323.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/tojatisasetanalivusisisow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=genshin+impact+android+listPDF 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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 10816 bytes
SHA-256: 092080ba18ae1218f65c962d092e348e9e96c7aef1ba3afae34a7194039fdea5
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16904 bytes
SHA-256: 31d2fec1d1eae964c00ceb13daa34209b15d2ed904ac730824bbbc098f68b794
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1