Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fe36d27dcd1e55…

MALICIOUS

PDF

105.4 KB Created: 2021-05-27 00:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0dc52750d345b3066435f9c682f6be9b SHA-1: 594b58d1371c7595c91066d328691e2fa107ab8a SHA-256: 49fe36d27dcd1e5573190f2775de2966ec148558dfbfc51eee5e3aeb9db417c4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=alternate+future+of+the+world+zealandia+mapping PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4qdg8btkj2u9u2kniv0pdli6kh/rejefikafipememufope.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/44010836712.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e4c94fdee0229610fff19ab569fe9888/tuboma.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/789c45b1e4120079263b87289dea64de/lukogeruzefe.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/99976653947.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/045a98c305c1c815ce80f5306b1224d8/zububuzaki.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b80pupjdqk3dmitk0qv59tukok/85255419381.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5dpbg1qg9vumcgifm03c00j01o/lokaxenidilabu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874378a24d1---28977235291.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jstlb5i1dqhqb0lk2n6ki3dfv2/99331965486.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/relepirerawukavat.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pi8de7rv2dvkr8mhb4pl1o4v51/lupovur.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5698a7c283d3711b2a11ee004aa5cac5/bojane.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a06a40b0---kobebolutip.pdfIn PDF document text
    • http://charivne.info/images/file/9009284923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ca45073d4bc6becdf11c526190209c0/lepujov.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5A 5408 bytes
SHA-256: 1fa3cddb2a594fd5f1b2577c1e626bbdb6236a7f37ee4fca3320cb1ee4c8de28
font_01_sfnt_off00017eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB0 14632 bytes
SHA-256: 28519dff33e42d4d57507554d22fcee717be0a1d601aa8e305e6dc8f1ae1f7d9

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