Malicious PDF — malware analysis report

Static analysis result for SHA-256 f405798880ca31bd…

MALICIOUS

PDF

76.9 KB Created: 2021-07-18 02:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ce8404cd59b21435587f916ace95812 SHA-1: 06bdeae3859c6f64059231ea1b4c54db2808ba19 SHA-256: f405798880ca31bd602148599b877270497df61adcad3a52f08f1943ec12ce06
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/55945455381.pdf In PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/segefujutibufot.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/3032366868.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3449fc8183e4779376148a6abe5f4407/36060407835.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/94574839145.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/1855699236.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/lr9u7g9r76pmqo5kcmen6uua53/jibamezuwabid.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db7677fe9---57293407630.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fopekuwaf.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/378cc72a47a44d8ed186dea92b05969d/93728272727.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7b90eba9---62767309133.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88510792926.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/zafefaperib.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdfIn PDF document text
    • https://tantecoccole016.it/file/muperopumaperapiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7010bad792---jegepapunigatupuwutaperew.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pugubowekizalikadigumaj.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d42def8c27bd92f127247006de049d74/rovidezipude.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/25816388264.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/3955154957.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/575aa0bfbt0111snu5hu3bcbn6/bamilapopaboraj.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/rigipowomureje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ghosted+love+gone+missing+online+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 17156 bytes
SHA-256: 5514c9f1fc8ec120a8a32745c9247adb85b5fde10fc316ee168c2e59b2ab40ff
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10744 bytes
SHA-256: 3373ea6ffbf01cdee99b2c36ce919222c6b2bfeb81ab3db2abace3df992cc202

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