Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c3f939bcc2473…

MALICIOUS

PDF

82.5 KB Created: 2021-06-26 13:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 875a60c01ef2938682db600eea46428d SHA-1: 403d46894e6e73c8eb8e67379e0f4469012b0faf SHA-256: 4d8c3f939bcc2473628ab3225d5218536a9963992a1c86d3880f5a3cc232f900
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktb16fqvvv32eof9p3ba0b0pq3/91598734421.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e8fe40de---faripevuxusikupimarufifil.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/70411dc068518467c66c4fafe27e0982/52026734540.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ec68ede---rawubiru.pdf
    • http://faradbox.pl/files/file/76817837025.pdf
    • https://cuisinescartier.ca/upload/editor/file/34607480156.pdf
    • http://aliceinformaticasrl.com/user/pages/44348077955.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/91cf9eaa442d6f9d4ae4dfe868ac3976/4745914997.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/afbcd7c10c66bdafb7e8f34b32bc335a/85745637330.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/40734923009.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ca3677906---66119776965.pdf
    • http://aelma.com/sites/default/userfiles/file/mararafodejotuzut.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/56884197554.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8f6c994d---91224880692.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/89489c82577b9a2e5a00276fe12ee8ec/99782960971.pdf
    • http://diversecityuk.com/userfiles/file/84227105729.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941b84bf2c1---70221996699.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071626be180b---bomerevapuwazixe.pdf
    • http://www.ecostroyservis.ru/File/35667137369.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f62202a7f38749ca652ed7accd0aa6d/rimadixoxinal.pdf
    • http://swiss-ex.com/pelixomo.pdf
    • http://ufnk.fr/app/webroot/files/file/zagutasajabuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alveoli+of+the+lungs+tissue
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16792 bytes
font_01_sfnt_off0000fb69.bin
a50b9b81735f8db3f5eccc92c6091639c11cd4001a10259d21b39db4c65c851f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 16352 bytes
font_02_sfnt_off000125aa.bin
44c9280cd6a1d2e8a3855df03adafab5d4bdb0d03369cade689a0d23fddbd3bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10376 bytes