Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd9850cc74d1d69…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d5ad56265db3cca96c5c06df58d571b SHA-1: 364f80e48cb8aaa3d6e007894e3349e46106cced SHA-256: 0dd9850cc74d1d6992b88be255765a748222aa93852925d655e2fa82fb3d69fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

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://queure.ru/uplcv?utm_term=black+android+wallpaper+hd PDF link annotation
    • https://marblo.ph/app/webroot/img/files/kirepipinabulemurixiv.pdfIn PDF document text
    • https://produse-zilan.ro/files/gexegafalupibamax.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/dumejojudojeluxu.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nedagolokanerusubidugi.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/pufozitunizezabalumok.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/sigazarapasabikoju.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/28867912869.pdfIn PDF document text
    • https://seikai.jp/free_images/files/89620638138.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/98987168126.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac660d4a04---vuvoxab.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/43555848099.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905235618514.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/rolelububosutigal.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/visazokirizupubalebamax.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304a832dcdc---berigavudokekaj.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/kafimekisududimasidifa.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/vevililapofimebi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0de99bc4f6ed6bdb9f0771e52e5eeda2/jisixosi.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/xegovivopepinejabonobok.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/93582619807.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/34106826968.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6ac21ffb96f7aa9111166ff6440772e0/21644783755.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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10576 bytes
SHA-256: 31758a0d634090a07fc2ac710deb9f2f698d798c255d57b21daf7486a76c52de
font_02_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 17304 bytes
SHA-256: 507100f3240d55d3f18a9e331819b49220b8cb761d815f146899d8e25cde374e

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