Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f44781dbbff0922…

MALICIOUS

PDF

60.6 KB Created: 2021-06-25 06:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f4ac8a23b8fb5ba29bd7853e818752bd SHA-1: da6e181b39be3717312f33a70ddf1ee8fe66273c SHA-256: 0f44781dbbff092260ee8e12161ec780f368d13b113b8256ae10c61f707e61ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=family+and+friends+class+book+3+pdf PDF link annotation
    • http://amsaneeraus.fi/userfiles/files/xupujetesovizu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/98467693802.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160864f39267bb---fokebavimokozuj.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/24665673197.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930477561b2---pidisagajutegujuvanaduti.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hi4eaav0vphsn2ru6unfhqjscl/zafitolejanevinifima.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/84816693285.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/91874757065.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/rixuzejofali.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080da82081e7---25466274401.pdfIn PDF document text
    • http://sooclose.eu/upload/File/rigejobugajuso.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0198a9edb---51621345348.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083682d65a3e---22819372783.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f436f1aaa---96612538528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD12 5724 bytes
SHA-256: 45d8a369e426c3a82bd4ead2e5b1ee5fd376457e04d1eebc3647da126acd7e38
font_01_sfnt_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 11160 bytes
SHA-256: 95d486b3fa14dd323a83d305717ca5f1adeafb07b5bd8b03cb2de5d8bfb4d7ce

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