Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcb6a6ca02dd4d2…

MALICIOUS

PDF

95.5 KB Created: 2021-07-21 03:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4a08c60e7977d9847ad81d1dc5d81f5 SHA-1: a986d9c33129a79e1972f5d080d993d27dd7bf8b SHA-256: cdcb6a6ca02dd4d279b59994f8f901ff4e854a558f921c6139b082a09aa1705d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://srmhospitalities.com/images/bulk_images/files/daxiva.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97b9cd1aeaeff9916528db018dccfdd5/subunogesanu.pdf
    • http://heninrealty.com/userfiles/files/59758021183.pdf
    • http://arniestribu.com/campannas/file/puzakura.pdf
    • http://wingmanresearch.com/userfiles/files/74929623796.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/lufisenibanekekuwupax.pdf
    • http://www.tobywells.org/media/fckdir/file/wozijuwi.pdf
    • https://frontivo.ro/userfiles/file/funifer.pdf
    • http://jrmhandling.nl/upload/file/68866129221.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da7882df9c7---jimijafisug.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d76b75cfe35ad7b8e7e9346a38c135f0/1692404242.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f71fbe63daa1a94b2a2046eaa885347/titafisebupope.pdf
    • https://aronabritcan.com/userfiles/file/derusowedeguveliwalimar.pdf
    • http://akinmedical.com/uploads/file/93675679445.pdf
    • https://shidoremicrosys.com/media/83708786664.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/14818181116.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93570819c---nigokurav.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddcfea124a416cf91b0a87a219984319/jivagaxizekanezenuzesixem.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/gimatumex.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jeegu8254i0g8ju3codm94ujh1/80825420416.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477a694da3---41392636711.pdf
    • http://ansing.nl/userfiles/file/wenasefunon.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/849f5a943fe060f37470d572b1acdccb/46791718717.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/15c41d07e50f6ad6d532ddd7d544bb80/3371800852.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+power+of+subconscious+mind+pdf+download
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f7.bin
47414a5a02eb581fe5944ff19edc8c74a0a2e7f001f070cea403ec4a57b6c734
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 11076 bytes
font_01_sfnt_off00010363.bin
ed08ee0caceefd02af61a87aff3604066330e7a02273fd1d61bc63a4880a6b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 20816 bytes
font_02_sfnt_off0001393a.bin
8ef00c700067c5d9d8085a687338861bc8ec1a44d964599fd4df4b10639e1067
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 1932 bytes
font_03_sfnt_off0001420f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 16792 bytes
font_04_sfnt_off00015a20.bin
d67e846df74fae85413b4dbff1f372ead4194f122dea4de5c3b7eb34fa320503
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A20 16120 bytes