Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff023559ebe35495…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 21:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bfa10bd5c12fb1815c87f5cdfb223f15 SHA-1: a93e638ea444cbea769df56a0a16a41fd974f1bc SHA-256: ff023559ebe3549536ddebae4190a0ac83fa188e548c952770678de5b5e5f937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The PDF structure and embedded URLs suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=pathfinder+kingmaker+abilities PDF link annotation
    • https://hojoairport.com/images/file/kexulevumusasi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f44a3ed0---wolowobufonabegofovowet.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40031453500.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/96589110849.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/kowesadopajakape.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/nazoxuvoro.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/pizamimem.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/93277715039.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/30758039457.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/wumilujebuduwarewup.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a266704f07---rigolofikeb.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210908_647AD497D41BB2D0.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/domilimoriguxonipakajenom.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kukenenuxatinokivotebenoj.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/61596158756.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/684510495613c36981237e.pdfIn PDF document text
    • http://pb-book.com/user_file/file/11762858396.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/getowad.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///zufofar.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/35074480120.pdfIn 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://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_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 17396 bytes
SHA-256: b4eb51f853700a507f8b652bd9344086c5795058d7ae827a482dda0d6212da71
font_01_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 10916 bytes
SHA-256: 48c7659a90e976f9bbf70e4065a45a5d7c45d2ad0989808ea5e5399b9fbaaf3c