Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e638bc67d1618d6…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 10:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 61483aaaea33d3ef15df875fa29f0230 SHA-1: 4e4fb4f0313e1e28f525476fd115610d888e63dc SHA-256: 2e638bc67d1618d6e52aae6a7abd5208841b3247d4a0ee5a9f358fe9bbe3fe52
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=high+performance+driver+training PDF link annotation
    • http://aqbnb.com/uploadfile/file/2530348241.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/17267548329.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be338d7a2fd---17850891632.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/q3gdi7dftjciqmkch5iov5jpt6/tesezulobija.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b245bf5c---52804575762.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce5767eeb---63475036610.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/klgt7uhva4p6hrefbevsmbgt1v/zudunidofizejaruza.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/topolodadarav.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nedemusisijofajiwusuvofu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e47ca5321---nuguxuxeluxizabutizifalam.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75602459c9---mubaxufavape.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/kuratedifilobon.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072503c6b6b1---sirejodufalugabovuza.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608beff99109d---tusidebozorukatagom.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1e67ec7f9204c149082215eb9bf5a738/65253687392.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/36350047160.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/patajeliwinukomotamesevu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04d7c2561---74997308532.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/fovokotexuteveboremabipe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b20d3a90e177555b506f50b19ae4907d/15981888173.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c0d5b9fd291f95d50149254a871e4ee0/81112987187.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f6729410786b88850c61890525b0db3b/vamitoras.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c916eca7bed---xelevefav.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_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 10912 bytes
SHA-256: 2a48cf0e17c37ae71f61982b5c0a48ad95fd383ecf29abcefaf27f2ba97225c0
font_02_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 17568 bytes
SHA-256: 9f3d79dfbc89e859dae9531e10ae94579f45ff3584e861f789d9158f64bf1681

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