Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaf6d7d60ed7f3b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 19:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc2dc990c31d58770047b5303bce6f9b SHA-1: 3a0820793a4b2833ee196da9f4ea15ec331877fe SHA-256: 9eaf6d7d60ed7f3b82c32dd2f4319e416bf647d4672d540d0dea0d3964092b42
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary function appears to be redirecting users through a chain of links, potentially to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cuacuonnhanh.vn/Images_upload/files/tanotu.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6675a1d---90974256177.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b97b85813---5656903777.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rse5rcqukgma5kotbrj0h608u3/paxizizuvanejedokorabul.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/kunamimow.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/dofodepuvibidorisuf.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/kenitepazifumeniz.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16117798283996---bepufexizeso.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mesopesisazusegetu.pdfIn PDF document text
    • https://sealskinz.ru/files/file/16777205439.pdfIn PDF document text
    • http://area5srl.it/file/lipasibivaxotedarukaxipim.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ibru89vini76hn3tr64mrn49k2/waxozere.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/45694315292.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/pazubagubojapafumoganola.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced39c0ec7---rigamorikode.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/depaf.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/63604117297.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba9498901---48342454798.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3747249567---somirosarijen.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/14370552370.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/05701f07265e4fc36f4794f4705c77a0/rinojavuxubusifofaxipofus.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xoduwalarobasomuwoxevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=printable+bubble+letters+pdfPDF 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_off0000b6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D6 16820 bytes
SHA-256: 8ba45c9a72daea9174b1717e61ca35b2d5a6819f2318a089f4f6aed0136860f1
font_01_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10612 bytes
SHA-256: 66ebfcaf6d48c9223917932ca8d239390bfc77949342dc918cb2577388189203
font_02_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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