Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4dcac962b6485…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 12:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 420d53e9b2c55cd46b039b5c2bde4fae SHA-1: 825e09787d1deb65ab19060db4715d440eab398c SHA-256: 1db4dcac962b64857b461e57456924adb8c9503c07f72ee648a724ba869d18e9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm on disposable hosting, with multiple URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the 'invoice lure' heuristic suggest the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hzjksj.com/images/upload/File/digomokumenofuwugojobo.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/83je7ba4rrc4vr3sqknsg7vvgu/2277878353.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/96579487847.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113b0b1e1a3b---xavaka.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/13936993d737d6574100a58a65dc759e/kaxakarurakukij.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090651cb6e9f---sefofiz.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/55385912314.pdfIn PDF document text
    • https://noventa.cz/media/files/file/19963204912.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/78895355106.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/rezulijagubol.pdfIn PDF document text
    • https://fallsplat.se/file/jazunifewaxadebetuwaxes.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/ramexika.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dd3e76aad---gigazafizizekos.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/lasokazezase.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///simapubujesakumugobasij.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/minerasaruladevawa.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/96530887408.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161260043464a8---30669787710.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210831141243.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/mf6dq28vfj8g1d7418v48gp2h3/wujozefoxibifego.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/15673268597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=account+receivable+management+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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 17384 bytes
SHA-256: 3cd572f51a588c22b14bfd7c4bc701f833fc56ba752ecde2fd343cdebb476e4e
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 11084 bytes
SHA-256: e9a4d914906393f47ffe54e35a10740568e059a54802cfdfad189d5cbeb77f62

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