Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a4206277e193df…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 00:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 433f39d37a2b7a57ceb73d51376cc3cf SHA-1: 6bb1e6f49fa817c7205124edd5e2a1f7a9a86c30 SHA-256: 77a4206277e193df05d4c3b5754628ca3f3c1e88bc360801120b2c9db66a1678
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URLs, including one related to 'vpn not working android', indicates a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=vpn+not+working+android PDF link annotation
    • https://granitabrasive.hu/editor_up/niwigoreserel.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/dotosawariraga.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/6017578713.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/sonon.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/30920030302.pdfIn PDF document text
    • https://doitoutdoorz.com/file/SufDw0WF9rcWWhFp.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/musaxesovodavizo.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/13669701691.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae43cdd866---56830751290.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/botowekusekawevomiwutigi.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/32390821286.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/mujotijamog.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632024214GbJ8.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153870747573---88396840556.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/57721781551.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/90742051239.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/1782719220.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/59225693911.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/46849598790.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d96e6e37cd07f70c57f00a0021a57555/29102340548.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/96985675490.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/45561253755.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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 10368 bytes
SHA-256: bf8c58ff6505ac58ac9b5bbc9f60f614fcd20323fe82e798a500295adc7a3050
font_02_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 18756 bytes
SHA-256: d79d15d1c03d3787d0a81f9402a615e7c55a53a9c97f30e6b8e7428f67e6ce7a

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