Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9561b4ca532eb7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 11:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd6d941dd3bcfe6df7e047473b48cc14 SHA-1: a8ba0e852954a0c149b23c30533d925ff36dac91 SHA-256: cf9561b4ca532eb7a3372fb5b09d7486111f3012525598bd557a68c5d68d1704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tomas-music.com/contents//files/rotoxuzisotadoze.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/o5v26787ud2ssgbqmk9qpf8qg8/68131587695.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/706e4ecd44cb8b0cba3ee33a8e6f918b/mumaxotewikepifo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9702e741d90c9ad75154fbce5f46/duxupaxenok.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c6bc522e---rutuloxaj.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/difokisuzib.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/35085612399.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xabuxu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/minolas.pdfIn PDF document text
    • http://planbmedia.hu/files/vewisitimijolu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8242e46ee---49461515274.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8249dfc0b---19958272493.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/68286221593.pdfIn PDF document text
    • http://orem.mn/uploads/files/81489837968.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/081f1b18c3503ba600ac7d3499d4d40e/midagifolapojijaro.pdfIn PDF document text
    • http://mfahk.com/upload/files/todatoleda.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/96579289865.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/8632766488.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/juxufuzefabo.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/36693326854.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/29729006847.pdfIn PDF document text
    • http://wohingltd.com/userfiles/7611044381.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f90a80353ac39ea1d80d04bc6f2f5465/nezal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=forma%C3%A7%C3%A3o+de+micelas+pdfPDF 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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 21244 bytes
SHA-256: a3a716ea159adb1d452d0a7dd78ddc13e390ebaf1d693e4d13a80ef44e36113e
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 11020 bytes
SHA-256: a78a3f99771ee43dd4b9ef85c57ce041b72d77256110eb17251ffd8bc42464ff
font_02_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1