Malicious PDF — malware analysis report

Static analysis result for SHA-256 793ec0fb9307ebbf…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 11:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cfeb66efacd10d2c242922948b0d6172 SHA-1: 140c0ea4b9616a05671f63aae64f16263445e073 SHA-256: 793ec0fb9307ebbf4c785ebf6b7c344176ce56090af838f0112d7d4df24b06c7
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to host malicious content or redirect users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39631204961.pdf In PDF document text
    • http://kulturazebrak.cz/userfiles/tuvizomafemez.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/53854700069.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/cj9qgp3untqv919aeht9ofmr1u/nenapafu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/216019192.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/riruwemotegebupefogif.pdfIn PDF document text
    • https://ckmandarin.com/uploads/vumemajurukumorim.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tebagodeduwo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/glmlc9oe63acdnj3sbj02mu4d4/28301663495.pdfIn PDF document text
    • http://beiks.info/public/file/26551132726.pdfIn PDF document text
    • https://coluer.ir/documents/file/laferonorumised.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0110a3a1b2---sevisibopirizimeg.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/87434103758.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sonigutonewuxegevape.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072e4358a3---21873092924.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d3f9cf9f---64061457109.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6m4r9sdsb3a9iuh91lcgfbdhrfcllnrk/87382144454.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/50778989328.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b9d1091d08ec2fa8450ce81007673eef/gokonafafujexanafunuduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spinous+process+avulsion+fracturePDF 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_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 18120 bytes
SHA-256: 5248b4720a3c7cf1377d4ac043e27fb76e679c9903c743c93ecaa6e78fb62b61
font_01_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 10712 bytes
SHA-256: 94a4b528c6cf1f9af92b9e9b3edc80e250f92e989ca18e3dd25a79a45b757a37

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