Malicious PDF — malware analysis report

Static analysis result for SHA-256 3391d19c587b2716…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 06:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fd39a572f45d8460afc9ae09531844ab SHA-1: 71eeb5a929b9d692ce30f667a24d289310d1f4c4 SHA-256: 3391d19c587b27169604f1c2b1e2c2d2f5bf02235f61a8116622d24224a257d0
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a fake CAPTCHA lure, a common technique to trick users into interacting with malicious links. The document also includes numerous links to potentially compromised CMS upload directories, suggesting it is part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA strongly indicate an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ff486fca1eb21d3517398fb0a3d7ff96/jusebof.pdf In PDF document text
    • https://atraba-holding.com/userfiles/file/najolewujoke.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/44121969106.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1df353b66---38557667671.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978c068636c---88684420739.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/giwugozikuni.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/42314675505.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/xolisasufumitosanuwizan.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce556bc481---69305937158.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c50af252537---tenojafatanoj.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b12e0ce3---71668127140.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/da02465693f331aafe187fcad0d51aba/41709763815.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/qmhk4p2kjbsrmudo1lnbe17938/26373150047.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kufokumadawupasegur.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/digafojojibosadadivizu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/86340fd3a8072f05866d8ff6b67c7ee1/667720370.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/3301932758.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/60590080927.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/06682241a8551c36c079b65126f99b1e/rigozeb.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160844dfd60113---96792743908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+auto+followers+free+without+passwordPDF 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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 17140 bytes
SHA-256: 6c67846a080370b13cce920956d142e11a17326efbdb7e55ffa25dd3c472329e
font_02_sfnt_off0001316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 11084 bytes
SHA-256: 52aa83701069ac1649cd50898e84513acc56e345498b5f9454f13e63cc2e241e

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