Malicious PDF — malware analysis report

Static analysis result for SHA-256 403c3253ac785d11…

MALICIOUS

PDF

67.3 KB Created: 2021-05-16 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3887fa49cfd01eb613235e585d56e883 SHA-1: d125ff08f462c496b6a6ee83986b4bfcca635b2b SHA-256: 403c3253ac785d117307700bc4c839c448e14064737ab595de60b60108ee035e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body text, though heavily obfuscated, appears to be a lure related to a song download, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://coretry.ru/uplcv?utm_term=billo+thumka+laga+song++pagalworld+com
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8c7c658c---3176142675.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085791a14b07---werinalidedizeziliwosobo.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/q5gugjlqmap2tho2pee8kmpaum/72564107646.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501061750471631.pdf
    • http://robalton.es/Albums/images/file/%5C/8483600270.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9gdj14tk5atefsptg88iomso04/46522018986.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gjg86i6s2ldrqhqq0m2s61kapk/17888430519.pdf
    • https://eyetracking.pl/userfiles/file/88231243473.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/n90llh19ft41d3lg0hhqk2p4m3/27698719830.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f878645105a4885c6e7b7468478725d9/tiwuresusa.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706863dfa08---webupawag.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9db46de21bb684f2e618075e01909d50/71670396089.pdf
    • http://turnyras.lt/Files/file/69962340354.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf26193a11---javokebupidivipogivub.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/34108f0e4869140616b062ff513c8810/sesewi.pdf
    • http://caphegiabao.com/upload/fck/file/dosevokuzorokebutugenenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfac.bin
2db0a8851ca744e393a425f2daea9db14cc468ba25d10340ed30acda2aadca4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 5692 bytes
font_01_sfnt_off0000e2ec.bin
1e7e1ecd04efdf2a08df879b6d679070ba48c56415cd3c158e913cf20393be73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 11040 bytes

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