Malicious PDF — malware analysis report

Static analysis result for SHA-256 b416cd04adc6e8d4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 06:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8088ff85fdbaa7602e875b88041145a9 SHA-1: 5770cdf9996c0d783065aeda6aabee06fbaf885e SHA-256: b416cd04adc6e8d4e225cf68a74b5d71bee6fe9814dfa3c7cb69da8986fc0fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=guilford+county+property+tax+lookup PDF link annotation
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/59101549524.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b74f51577---81870428041.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/38551639008.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ks2dvfm03115quoe8be628mev4/vuwalukazivadirawil.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/vomasurib.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5cc461e7d6873224820f6425ede5680e/16346518630.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/d5kqn275e5fk36aags0414nj15/busobuvowowomibokelot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/657e7f9bf9f73935bf16d65841b1e2dc/83160510548.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/dolusib.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/rezefetalej.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88e78487---26189431940.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52f918886---61985395159.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/89780161484.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///xutusodezalepumapaziza.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cf95e9c3cc194d1bb58d195beb8633c6/46852312232.pdfIn PDF document text
    • http://islandpointfl.com/userimages/78594866052.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c089e1ea82f---48954939570.pdfIn PDF document text
    • http://nature-revive.org/files/file/31665577365.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/83189576713.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/90605761999.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/42597306349.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/98411629179.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10892 bytes
SHA-256: bcd996135c9b8bdc72bd185605ed0a71f3a4bce7124d8ae00fb39b9c0b8fc0d2
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 18276 bytes
SHA-256: 3b87198008db854ef62a74787587c7abe5a1d2860af70dade9a61749ac2d3d99

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