Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f4c41e375280f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 11:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c90af5a658ba92a1605da9d7f63329a SHA-1: 7febca0413cd064aaea1a425f494ade3b5ee3d15 SHA-256: b67f4c41e375280f3dd2da268ce72203cdad891d0be6516dc4352cc6cf4e3b94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rdsdealers.com/ckfinder/userfiles/files/94456188925.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be18cb09c9---13414348587.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fofitovosejanesujogoba.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/786da349967108563fdabad91ac0ad03/duriginakapamedi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/89d13t6hmmtm7cnlp08etstrfm/34747127037.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/13771648762.pdfIn PDF document text
    • https://topupdana.com/contents//files/duzev.pdfIn PDF document text
    • https://blokhol.com/upload/files/gaweb.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/39197837445.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/xenisogiguwatetesag.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/78376370969.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/89498833917.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdec3d5f8e---9423323374.pdfIn PDF document text
    • https://ivaco.it/file/86543774797.pdfIn PDF document text
    • https://tekartltd.com/upload/files/22098815410.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vikelozabizobopevik.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01456aab36---xuxuzagitovobenituvom.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/tafuwojoriviziv.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c745cb8e975bec4068585a60f5abec49/91200539775.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160793282cdbdb---63563825210.pdfIn PDF document text
    • http://licausi.it/userfiles/files/15786701873.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af8258e68---gotaganelogavulol.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/21859761881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=manual+siconv+rendimento+de+aplica%C3%A7%C3%A3oPDF 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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 11300 bytes
SHA-256: cf67ff32a7decbbc5f171476d458046f76f44748c26b3b31954f056881251bae
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 19316 bytes
SHA-256: 1f64283e62cb8892259b46fbda121e50c378e3ef157a32178c561022962f8b0e

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