Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bf059a1a415b8c…

MALICIOUS

PDF

72.1 KB Created: 2021-10-01 14:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3a02caea4f37728873b41ab6703628ec SHA-1: f5574daca709ceb51a23abeb17b1fdc2478d7175 SHA-256: 02bf059a1a415b8cdc4f480cc8f6aa147c947eb0806c2c37574ea95441cd7ee6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links to PDF files on various hosts suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://valencia.thepokeluau.com/uploads/files/bijepebuzekadin.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/guwasap.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/614c664324e84.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/2275660958.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/mijaviweketikuvo.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/72455003849.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oue1cqa11ajkgh6t6k81r65u47/50020686529.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/17456344380.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/82053127869.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/xamojegaluzokudigaluw.pdfIn PDF document text
    • http://trovas.com/userimages/xuvavipakuxogugikebi.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xudomufazexabetuz.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/18683577724.pdfIn PDF document text
    • http://kaies.net/upfiles/210905192512383074pyg81r.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/sitapasomowofakuxudatowe.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/72464300595.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wagapufola.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9b94d6d7---diwisavuteva.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/13838124415.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9eaa7b4dc15399ff40765f3242732a6/96126484798.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/dakezigusabajozon.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/87418508459.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/suwofefikapar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=empty+room+2001+watch+onlinePDF 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_off0000b172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 10948 bytes
SHA-256: 745284aa26e073a151636288696759fc2b4d3c69299571ca8bef370812ecd10b
font_02_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 18208 bytes
SHA-256: 07ba9fb65fc858e3424a500e1fee76f32130bbd34b2f1d12fcb67789cf2c55d7