Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2db471bfbb17d87…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 19:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13d2414f7c57881b70c01cb72facc628 SHA-1: d7a6ba12a57c65c2c21049931e8ede5511877bb5 SHA-256: b2db471bfbb17d87067f4cdac97211d7265ed1145b873c97bc367a7da5764f08
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as potentially compromised or disposable, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gimhaejazz.com/fckeditor/userfiles/image/45323521928.pdf In PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/feperuvakarunugegepedoki.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/nifuwimogubotojo.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/femiz.pdfIn PDF document text
    • http://vo23.ru/upload/file/jipozirokudidosalo.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/22633521732.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/he9sr0inikpoe60sgjrd7jgr2e/803584353.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15717498812.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/foboxu.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/telabawuxexizokoneni.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/2115435150.pdfIn PDF document text
    • http://idroter.org/userfiles/files/68353788614.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/33291669491.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354feadaa00---38727965318.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/61844305703.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xuvoj.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zikizofiduxamurovudesivux.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/sukebanoga.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/15792999799.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131950368259.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/wuwamajuropikav.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914135556_1730445794.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/84006704238.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/mesazono.pdfIn PDF document text
    • http://aprt1day.ru/file/40466068426.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613651155e0ec---73640699996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=english+grammar+exercisesPDF 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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 17880 bytes
SHA-256: 54c11f1eeadcec93ebb6c328ae41f80b360c0030b7c36cdd9d4a2a76ebd787ea
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 10544 bytes
SHA-256: a6cf2ed4fb2a65fd15bcc912b54d8a9ca45646256271bcb9972a7f23856f26fc