Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d96ca179ddd547…

MALICIOUS

PDF

83.4 KB Created: 2021-08-22 00:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71ed30b2d0d7c442f96ae6b2570d5b28 SHA-1: d8d375a4ef1c6cabaa45bdad6b319a50e9c17b70 SHA-256: 29d96ca179ddd547a0f0cd1dc0931392ffa8364ffe9a7c268105be391b24a6c7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to potentially malicious content, including a high-severity PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier also flagged it as malicious. While no scripts were extracted, the presence of external links and a 'download button' lure suggests an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/14520541669.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k3u0ke7ai6ebi82us4cdfsgv66/65946751748.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/97529288200.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bdpduddrvh7h8uauu8pm48rc7o/58524474581.pdfIn PDF document text
    • http://plncse.hu/php_data/file/vaxozurivogobowuva.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2dab6de3---gasufijimimarepegenunivab.pdfIn PDF document text
    • https://premium-house.uz/images/file/6647340735.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8611430b5---poxawafojivafaf.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cff804be570eb2199e74e60b82fced20/xawidonuxujemusidop.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9uinnjb271ech7hual7sb0f1c6/nugazovivusij.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/bafageruxeres.pdfIn PDF document text
    • http://nfc.soo.jp/file/dewatibesaxemiwojixenefo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/429a793d0fe65670f7bd598f91fb4d17/50408369581.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/10431070449.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/27vul6747eh0adtds6gfij9j34/bimilibop.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/pamovisevupanefivaze.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b6edad24---26249840602.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc38800118e---59848295524.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/ruxefo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608536a2d7913---83361229388.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/94187113349.pdfIn PDF document text
    • http://artospace.com/pics/file/19455078386.pdfIn PDF document text
    • https://5uempat.com/contents//files/49473037822.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/65086465908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dr+khader+books+in+kannada+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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10672 bytes
SHA-256: 7eff1c06b413eb46d9c2c0824d87762928c96ae35c578dc741b9f3ce36a1854c
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16812 bytes
SHA-256: 62ffc395f6d2ae4187b911a9be17803e5a4802d2fc4564d8080af25df3d236c6

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