Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49d66b53d53bd38…

MALICIOUS

PDF

83.5 KB Created: 2021-07-06 09:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35323214c94e1360ee3917cb895fbbbe SHA-1: 2427eb949027579c65170b102aa587d736f5e468 SHA-256: c49d66b53d53bd383edc6a7bc89530c4c7fc6040632382ce6d233e6c46ef255f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links to potentially malicious content is a significant indicator of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e01e2ac14a8---novomupupowijam.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/d69gnq0t293i6oafhugpomju1d/dotukujesazikivoweveno.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1a1034b3c3b91098c3523012d66ef2f4/30100975436.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/f1oni81r6kmgf9mq5vpsugbhpv/91628682535.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/0i515o80g38napqo5njeabnh9n/83186180993.pdf
    • https://appfacile.it/file/vexabitizajogup.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8ebc222784859e5b5ea49fee84f96a93/vopufagi.pdf
    • http://kaithompson.com/userfiles/file/88245110204.pdf
    • http://braciszewska-klimek.pl/fck_files/file/44237887612.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a78e6bbc2---deradokefebejevapebafalu.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/krjo5uoehqs27f5615slr2du63/16480377376.pdf
    • https://artlabjo.com/userfiles/file/78193737157.pdf
    • https://watertorens.nl/userfiles/file/89550065914.pdf
    • http://njf724.com/basefile/janatalnajafcom/files/kejimapabirafexajeg.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/6utkj6spomqv9q0atnpbakjgd1/47340308352.pdf
    • http://thedreams.cz/files/99459636091.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7ts90rvomi0uu7hh00a45qnj5/58037422368.pdf
    • https://fotofidelity.cz/userfiles/file/badubumubadovewejevijute.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b1faff4b4d2e21d1706c5cb7464a5db7/87961520661.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bfac92dcf0b42fdcaa4131003a723ef8/kefesinagono.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160700dc671843---rotozavibatesokowe.pdf
    • http://box8websites.com/ckfinder/userfiles/files/magefad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=proportional+weir+in+grit+chamber
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc91.bin
b8303f1e0950f56aaba057990fbdc41117317dfc42fd519f8863e7ca4c24b611
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 17256 bytes
font_01_sfnt_off0000f9f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 16792 bytes
font_02_sfnt_off0001120e.bin
6721d0c727dbb0b8b9f7b0a365b24e461c8488dc1ca8ef11a0101957c28bc5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 10880 bytes
font_03_sfnt_off00012ace.bin
15bdb3869d8d4458aad361551f68459b5691bbaf699be9bec01cb82de0a2cecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16156 bytes