Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc52d20bf91fc7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 06:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a676c497aeb5a66e98c16fe0a2791453 SHA-1: db8bca9f0f7b197af7e881c73c788c907ad46790 SHA-256: f1dc52d20bf91fc7af5fd1af2a7749ee5f215698843c0547730a05450030f09b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support the attack pattern of luring users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://miet.hu/kepek/10297862073.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/runowavu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/82106839947.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vodalodal.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/46480774529.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/40468084668.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kubawi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pazurinukapujenudoxonef.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/fujajuboxazixafo.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/vulavunurokibeboj.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/jopewelapemewazuxipatibu.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/nomemekololususijo.pdfIn PDF document text
    • http://kodemari.info/data/files/68195713359.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908193354.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/81974527466.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/gopofalixibemupeb.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/47215110149.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cf3eb1b6---11144332406.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/99314427730.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/edconp6qu6q3u3bl63o76bje9v/jomewesosira.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/41287d10a9fac8cde032a5798351fb44/27030186423.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rodokuwemiriwujawalak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ispoofer+on+pcPDF 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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 10024 bytes
SHA-256: 1110eca12317513581d12863841340ef2fd8de6355c82a9e630166e6c79253c8
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 18044 bytes
SHA-256: f1be5b445eb7aa261932f88fba64590fd594336379ef0aef87403cb9ac63904a
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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