Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6e8fe38aaa037d…

MALICIOUS

PDF

102.1 KB Created: 2021-07-07 06:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a90e59293f99ce1b07b435040614acf9 SHA-1: 5a864f0c0e4b7598538432287670712e45715385 SHA-256: 9f6e8fe38aaa037dfc718f3ed893a5797e4d5a5e5c455b605e4658358c715f95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56fa9e0e4---13982943756.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88aa7209c3---topimesokedaxajazimumo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448f0d2ca7---xetopiwatedukojakab.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8dc630a151d40700019e4d92c3b602f0/9577831856.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b388bece3a9---65651443699.pdf
    • http://fdscience.com/UPFILE/userfiles/files/11516919842.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hjihpdmg9op06f26nicvu3gl95/wajazin.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/d1372e2ef7e4813988df1229b222fde3/41298268626.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ca78a660---zekolufa.pdf
    • https://alshamiltrading.com/alshamilfiles/file/zeketasajo.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xawoj.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2369cb6f---46158252992.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b95a81dd43b83359b1ed3d7cfe67519a/60251487082.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/92359709442.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/m6io9surri40gqsjsmljsqlkq5/jisatakowemudumevix.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b200377d---1015525560.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9046f812---36793421002.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078091b32439---biwevat.pdf
    • https://aartipalette.com/userfiles/file/73298976538.pdf
    • http://crackershrimp.com/file_media/file_image/file/vodapexu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fe922216---35050503078.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb6bd7610---53031532953.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6hpkavg2po9qj7396gtcj8kk77/vejixezexiritebomil.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tk2aj8bh04p10v0sqno203od81/zonowokigobofidejix.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/03ba6adbbe68a44d181dea6830bf357e/zilipu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bad+words+with+r
    • 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_off00012ba4.bin
5c87d69187ca9422b9db151aa5616bd6a3c36e3c1217edada5f1025a0a3115a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 19312 bytes
font_01_sfnt_off00015d19.bin
16e2267a4689552239abf64f17b423ad6a8f9eb5c109df4e9e0d912e295f2535
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D19 10204 bytes
font_02_sfnt_off0001742a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1742A 16792 bytes