Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd39596ef033b8c…

MALICIOUS

PDF

79.9 KB Created: 2021-07-08 23:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d850329715ca632c62b44f4ddb174c3f SHA-1: 667a1332d2fd99d6bc559e88b02936d2722d1a91 SHA-256: 6dd39596ef033b8c30ef8e934ae79062a870b71bf3f0e803995b62edb99116f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://18554080.com/userfiles/file/17358225148.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6ee2352ecbfc7c050f90a14971f6308c/niduje.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f3417bd1---fudaguxisonoxatibo.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/85a38feb37d8110e63ff2da64c01cddc/45918972097.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/35427847125.pdf
    • http://ski-experience-japan.com/images/blog//file/85369502099.pdf
    • http://asja-doll.ru/userfiles/file/sudafogezimakepogibug.pdf
    • https://ntwbearing.com/UserFiles/File/34666159737.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e961afa8---wiwigijudofoxuwatuwetegiv.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/hibbvf0clogvbvhr7k2vbvl0k1/46744919856.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/896648faf75daf895fe9c1ef3e80c7cd/95276926860.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/311aeee91baf1ec47d20b60ceaca840c/53999321805.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c176442bd3e---ragovevupulugunirizem.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/14c63b90ec53257571fafc90dacaa97c/fawumetet.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80aae6cdd0---falejinigofiduvatuxuzu.pdf
    • http://energo-winstal.pl/userfiles/file/90633646065.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/zuvimejelepusowazuvolut.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b8422899db757b8d0ac1331e31f55b0/52817700149.pdf
    • http://versobrokers.eu/userfiles/files/3022861906.pdf
    • https://rmp-familienanzeigen.de/cms/files/gesosekiwimezex.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732b04445c8---84651206968.pdf
    • http://richmediahouse.com/admin/uploads/file/53536141031.pdf
    • http://sibmetiz.ru/upload_picture/mabosopuzez.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b373cd560d9bc86bf12efa94d325df78/95232280578.pdf
    • https://binarbaid.com/public_html/userfiles/file/99440280388.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+wonder+that+was+india+vol+1+pdf
    • 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_off0000d5ba.bin
a024ddeba766716c708b292b81c213749476204f9d59fb3dabe0c4813bba63e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 10760 bytes
font_01_sfnt_off0000ee8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
font_02_sfnt_off0001069c.bin
f570df95ee7414be85166ea7cfa338660f02341667fea25ca8e6fa320762d2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 16668 bytes