Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be7760d6f413c20…

MALICIOUS

PDF

93.6 KB Created: 2021-09-06 05:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 417b162ef482818937c0f939718ff3fe SHA-1: d23ee1ff5cd50c46d8e6343e8a27ad4513f77d94 SHA-256: 5be7760d6f413c206e1f95f0828ebc727551ea69ef9a28c9db11512abb155ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=reliability+theory+book+pdf PDF link annotation
    • http://olgapolyakova.de/files/files/94136812445.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/95568344056.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d8a743b9b3ba1b5826eb6a0a2d1ec05d/labejinipixid.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/xobotigi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e409598b76---likimavukoteviparekukizix.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/aed3efecdc07c5297c423eda2a18b0ac/lizirabetexunoturato.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/78090237363.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf97901f01---binarisikin.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/xenakawevukorenofe.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/pokasarikivimi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6ea9467b---nipipujibibonu.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/lizutijijejikanikuwa.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/juwitiwemoxenakop.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/69786987871.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/13304849529.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1847850c8be523442cf607acb53722c0/59576270527.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338ba77839---53367618224.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2e1fd371c---37284113372.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc74a547dece4deb48a6fa7415377d07/kibilevurete.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/360ec63dcfad3ff5853b79fef584ad3b/85687689064.pdfIn PDF document text
    • http://derma-dts.de/files/file/74036609293.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780d5128a77---nufonukiwenuvonoj.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_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 10712 bytes
SHA-256: 9ba65416439b164cfd18899018ca814e8b4f877a2aa9a2fd0e7e637b0037c287
font_01_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 17688 bytes
SHA-256: b3251281c96bc2cb659a5eba1b1bcaa9e499ab9a7b086eb3c43990c658badf3a

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