Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc842b40fff15976…

MALICIOUS

PDF

84.4 KB Created: 2021-08-14 23:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0bc0e6057ee73f91973fc8a8c7717cfb SHA-1: 3df92fdb77efbb4941aa4fa00022d9035102d06a SHA-256: cc842b40fff159765dd43dbdde49827fffb13027b1eab1bbecbb41a4cb05b74b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves using these links to lure victims into phishing sites or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=what+questions+to+ask+in+a+chef+interview PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f76618bc7460c906819fb9a8d6407649/babojizawijuzoteteloko.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/71722298849.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866cbc22bcc---ziviwewetisozemefij.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d93bae39c7db85e984413877b6b63420/28768653370.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b366e5e9b48---mefanu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca9d02522---64303270961.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/v76remr0nttotdl5gogbgv6l00/disazodimoribifumaselomuv.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/85119410671.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/96984709605.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/37372550081.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe7cbf25a---90812514789.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f139261dd34---45683598857.pdfIn PDF document text
    • https://kopari.hu/files/file/pubetoti.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6604a4c707a5a08d47d320307f401281/20121767089.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/25636209073.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/84728774440.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/36220179412.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/941d7f672ca645b78cd8356a5b1a5fe4/dokuwovugog.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8b21f6cdfa6eae62e9ffe407f52635fd/64863853862.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160717c0e20b34---pagatavejud.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fuxijafaju.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/16b8382411b49906a7b9569c1725dc11/menoxixik.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mogam.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ffcc5ffb66d360906c6d4a1528f9ebe3/fepaki.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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16456 bytes
SHA-256: 30dc864dc4dc5639d8b85e302925d44b0393b12b29cd7eac5e477b4ba224ea05
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 10868 bytes
SHA-256: 9f54619c3ffa63765a06784815601024d12968141e6cbf5f5f181217be377bae

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