Malicious PDF — malware analysis report

Static analysis result for SHA-256 21315966a6373bf3…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 21:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dae4c5664454bd7aa5da1a083150398d SHA-1: a294248b36a4a645b3484c254714113672761ae1 SHA-256: 21315966a6373bf3c4355362bd6af3dcfafdac1103aed4b9bce6be87eff056c1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1282f1198---gepunamifam.pdf
    • http://studiogallerani.it/userfiles/files/86147280323.pdf
    • http://paroissedementon.fr/upload/files/44389263837.pdf
    • http://doks-films.com/pcms/content/file/xumovedapanavilisukifa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/20f047f4aafa5603ac3b8b2524b84e7a/kifuzo.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851d56a0e39---kovumafabelexexoxafaji.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/294bd75c441e92ee502f32c134d6e64b/17333903422.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/74605564292.pdf
    • https://securityguardsupply.org/php/uploads/file/jasemoritebigudaf.pdf
    • http://on-video.com/movies/movie_data/file/18754422283.pdf
    • http://climtech.com/files/files/biginekogokipi.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4436b7e1---32262707678.pdf
    • http://matraholding.hu/images/userfiles/files/vixutuzot.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608073115c4b5---16436322940.pdf
    • https://greenfuturevietnam.com/Upload/files/93505985184.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fcdac0e66---nunasanisefaneweralezudip.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b716898a3---mafusuneni.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cee8e05bc999c828d5c0f0930623381e/47324905609.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/77368221762.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/122da98c8ee45243ee2c9611d0f4f335/98839149076.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed6fa34694---84964486808.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a5c07e25ae786b577d709455ba9d9b34/33484046754.pdf
    • http://laweasy.kr/userfiles/file/kavuwavonure.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//89432075032.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+most+useful+phrasal+verbs
    • 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_off0000ea67.bin
df9f63ca06215b007b241911b6e4cec3453c1468c7562bf7a29d1126cec381f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10696 bytes
font_01_sfnt_off000102cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
font_02_sfnt_off00011adf.bin
979ef20055af77f344bfc5141719165ceb8de2e3b02459f6a31608a2a05650d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 17700 bytes