Malicious PDF — malware analysis report

Static analysis result for SHA-256 09642ade66f0fd3b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dc822d3985074541ba11441d15d30e6 SHA-1: 0ae1c72e5ad9c61141f4c765041508a9f7db931a SHA-256: 09642ade66f0fd3b796cddd3d03ce73569bf3299139989f9566852ba0e65221c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to domains that appear to be compromised or disposable, indicating a link farm designed to distribute traffic to various sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ottuk-e.org/userData/board/file/lidari.pdf In PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/25867947004.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c08d94a1---pituzibu.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/97321122180.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/64104046151.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/50396880259.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/legoretevegavexifezipif.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/38598562984.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a477c85a---44374334630.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4db03ab2d---71716548904.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/48usf4f2k395q4ppla9hl4nltb/27163785510.pdfIn PDF document text
    • http://jump360.co/upload/files/20210816161437.pdfIn PDF document text
    • http://zamgph.com/uploads/file/301944331930.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/605d216b58fead6588988abc710c857c/pakijomakejiwu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/febugeteve.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kekidutove.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/16346977032.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/buvox.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/36116444479.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nupufuguzidovelosez.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cec977162---29371916627.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/lm1080019ats2qpt4srjpslkn4/wesopanuzikajewatibexuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pragmatica+linguistica+pdfPDF link annotation
    • 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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10812 bytes
SHA-256: bde1baddf38e27c9ee7851a7187c145f6917e826da6ad145174cca52452fdbca
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 18104 bytes
SHA-256: f80dcadf4de43459ed574639e3e9f3da9797668a1fdf8f7155682e9e5ac81a02
font_02_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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