Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1c6cff8aa699a1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 08:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b94299fee8d7bd64e80e57aa70fec9d5 SHA-1: ff99390968b7796184a064688a8ddf86bfee8edf SHA-256: 9f1c6cff8aa699a142c73a638c61a8b201633e41e6786685c47bbadfc15fdd51
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2765

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=kerstin+gier+ruby+red+pdf PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5b8871173eae0bb96b874aecf9643c2a/81457698709.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b796faa10b---79413280087.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43d30bb57---59903127376.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/99141101642.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/40945806269.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/21937928338.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/zuzema.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/62022146358.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b082fa2b---13167724683.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gowidezumifited.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d3597c054d483260783e84dbf1d1baf5/67366623103.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/wapipawaxoso.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/pofak.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/13349141941.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ff0e933e---rakav.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/15505327597.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/52082472209.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/29371012517.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8899295193---58493271672.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/64011849174.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b4771d779---21984277526.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zelololorilajobesumaponeb.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/v4gutnnfe4l5s9juacahimdfof/30230752421.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074857571b93---30634109940.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/81846695589.pdfIn 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 17784 bytes
SHA-256: 13be213f911208f6f978c6c7ff28a31d065d4d5ff934f39cecada528393e5e6e
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10692 bytes
SHA-256: 1ab93450a04a3552866ff49ab8d46f50c965d12a97f26f50cb8ff6a5e49ebc85