Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ff900dc0491e2…

MALICIOUS

PDF

87.5 KB Created: 2021-10-08 18:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17de142dd5f032edf72eebb555327df8 SHA-1: b3a9162228f8b79a0681563c28a7b59e726e7bf6 SHA-256: b97ff900dc0491e2fca0175ac908c1a15592a6180a7043af94b32bb38f91ae55
156 Risk Score

Malware Insights

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

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, with many URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://thevale.us/userimages/wizobobatod.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/lemizizutexasiwure.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f7cbc59ba6a8ea72804876bdda8359c8/pirudoledanetimafajomir.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pozokapiwavojixopepaw.pdfIn PDF document text
    • http://hevolta.com/upload/file/98550329114.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a630aaa---35707156329.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/golovu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d08b28183a7ebf356a6e7bbdfd99f605/74285015596.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab5db404e---niladatav.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/tanazu.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/94308522907.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fedokasadak.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/molurowe.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/37434297958.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/11652915458.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/64646618785.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/85136124296.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/vusevevimazuxozobafa.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/kobolowa.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/berekusal.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210920154438_681218510.pdfIn PDF document text
    • http://www.grifin.sk/files/80823295215.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/6779366544.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/jokiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=aries+woman+in+relationshipsPDF 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_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10584 bytes
SHA-256: b6da712259ec9c7e7fc42331fc020b2f097e30733070d5ad5fd0da81adbb8ece
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 19260 bytes
SHA-256: 461d279f5dbe16496a79aeaf3667539dd7f6f7e51e296ed88bb7a2c07e37b5f8

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