Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c4c420a473c92…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4225cf82748e3040946eeb330915d2f4 SHA-1: ad46b61b2c03c2065f7425f640d4d19c406fb6ca SHA-256: f85c4c420a473c921416515da627af7bcd4a59ef9973dc0dd95f74fdd889b1dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • 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://csam-villepinte.org/uploads/images/file/nizegexavugumulud.pdf In PDF document text
    • http://cnpair.com/userfiles/file/wititogaxedisuxisomibu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/14365677379.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/14633806906.pdfIn PDF document text
    • http://orlickachata.cz/files/files/tufawut.pdfIn PDF document text
    • https://ms02bet.net/contents/files/ramudaxoga.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/88767898769.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sineroruvopagegixu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfeab1d9df---lulapofewaz.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/buretaruwovexexep.pdfIn PDF document text
    • http://js-space.de/userfiles/file/16706127587.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/17551447708.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/xabadezelukerotupo.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/safefitajogafejotuxamilek.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16158db447ec24---57318701719.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615c29965c2ff---70471663650.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kijukafileba.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/52330572598.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/rumabimaparem.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17869599463.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/fejuvaxa.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/naxasoza.pdfIn PDF document text
    • http://labonscafe.com/userfiles/73531371586.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/leladube.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zizesuzelome.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/80385359091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=love+aaj+kal+all+song+mp3PDF 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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 19900 bytes
SHA-256: 174e6ad4c3e897b92d31966a2c7584e5761e639cc7c25fbd512d6761c0c128a6
font_01_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 10724 bytes
SHA-256: aa93ce750f3d09a55fb1079991deaf1f7177cd3b0b8a425f9383604e555452b8
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1