Malicious PDF — malware analysis report

Static analysis result for SHA-256 d407be2b346a0846…

MALICIOUS

PDF

77.0 KB Created: 2021-06-10 07:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f428446cebde46eb4fe016c2871440 SHA-1: c1f639c51eb68c0920b1ae023a972aeb9d71a655 SHA-256: d407be2b346a0846a76b054039903c224ff0e2a06b5e9ede8b776999d281a98f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The presence of a URL with 'utm_term=heavy+bus+simulator+apk+download' indicates a lure for users searching for specific software. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=heavy+bus+simulator+apk+download
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985a00145ac---bukalipuvexufiwemumaxasa.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608313f67d6c3---93561211121.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1a0d2059a46648515e204e17a7f9735/figivewufogidab.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/520c4ceac1b54339f1004012a79610a3/30469043319.pdf
    • http://dfh-consulting.com/userfiles/file/72576217956.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mrbq8pjapmepi453vm4ul8b6fp/fujisiferiwuvijof.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/151b5803a2829a6f6709f5a4773f07e4/27790131798.pdf
    • https://hijaulumut.com/contents//files/2833487440.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b801c168b96---nunifiku.pdf
    • https://dynasty888.com/image/files/20210528_043251.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bbecab0c981---mimigitaxatumadumela.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d6b70bf37497dcceaa4907ba950d6842/26028270650.pdf
    • https://yuss.it/file/80114758310.pdf
    • http://matstravel.ru/userfiles/file/61893408903.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/77a71f26e18701563a43d94ba39cc163/lagofafafiwowixi.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160949c92c2332---lipunixazixejivuku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e271.bin
93b4072651a85927f1665ee3b840435afcd8d60b6d3298b30476073571ab97e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5524 bytes
font_01_sfnt_off0000f52f.bin
a5dc241910bff8d054f26b0dc44e0f05cce31393b543e5bf515f37262ffd4712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 15236 bytes

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