Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50f20febe1b157a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 794342dce26cbe52620a92b9cc28f7f4 SHA-1: 91787f45caeaf2f51bd25f7129a5ff33c022b2c6 SHA-256: c50f20febe1b157a57a9151842db7d06f5b175cea81000a43497630b7a7bccf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://smidgel.ru/uplcv?utm_term=location+setting+in+android PDF link annotation
    • http://kasargod.net/uploads/file/33314980340.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8203e401---nubuwugutipigatufegi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59281fd1f---19938311554.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/68652311708.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/93899103700.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c564cbdd8---sopix.pdfIn PDF document text
    • http://glassick.com/userfiles/file/36602497744.pdfIn PDF document text
    • http://st03.it/userfiles/files/fugiteke.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rupitadote.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/34411241346.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/466e7fb91d525ad81fa49bb1abdf58a6/lafadolajuzitolij.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/83365816095.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pejoxubanituwerezedajigaf.pdfIn PDF document text
    • http://uteambio.com/upload/files/xipezazapafutu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/10434072158.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/32556922432.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/71220131721.pdfIn PDF document text
    • https://naves.cz/res/file/moxekifovisizaloja.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/49100275140.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/jabizevasaf.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/2668907615.pdfIn PDF document text
    • http://ailizia.com/userfiles/xonedasakodariratuvini.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/3242733411.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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10456 bytes
SHA-256: df54b73774d74944fd3b9c7bad9d3e07961624d70984b6c62e0a1bde145ef580
font_02_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 18476 bytes
SHA-256: 7759fad579685e135cf8b0fea4bfe0ac12c17421d21075040d5507ba9ab37ba8