Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79c986f88a77ccc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 01:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb2cc909d10f5f5a000292ffe6a6440c SHA-1: ca0f71020825dc4982dd2b54749a0544063cea15 SHA-256: b79c986f88a77ccc8246213cc3bd0f0f5484074b37b5e2a97c8f5073501e4336
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=group+mms+android PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9629ca53---jires.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161391a08edb26---tajusofemigavavupux.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/24153028888.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/nopogazevaxizoxobewolaji.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/98824143690.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/50399877374.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/filuwufopoke.pdfIn PDF document text
    • http://rayer.cn/d/files/14306551625.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851555ec80---86666800242.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/lovawux.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • http://kbchina.de/upload/tujozup.pdfIn PDF document text
    • http://tipiland.net/upload/file/wafitedebazi.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/41017185280.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/65263509064.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/53128956680.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60348516194.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/poguguw.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40378829459.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/81578536540.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f25786c6---81680397842.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wasaxigewitetuxa.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 17632 bytes
SHA-256: 7fe259a651075e86e9463a8379f816d41284b331291ac9dbead2daaa88fcb490
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 10416 bytes
SHA-256: 2761b54f4afd91069bec7ea79f038d44a398792d3daad5c12da8a25479a1987c
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1