Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27e4a37eaf8db41…

MALICIOUS

PDF

118.2 KB Created: 2021-06-28 00:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84bf624ab836c50e0591f49371e363e SHA-1: 583ff9256e53c378938ce5c400fabadd7cb2df93 SHA-256: b27e4a37eaf8db410413ea49bf57639e18e01829039c7087ddfd72e8311677c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with lures like 'pokemon omega ruby free download for android', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=pokemon+omega+ruby+free+download+for+android
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/darevusujigazotip.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608520e276994---wodukekewelunuzegek.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccf0d573d---72047206736.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/301718852.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/el52qt5c51lri035ucup0ukvjo/xuwuzusidutanuse.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc82d2eb86---11757727562.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e7d071e---jilarenifiwosereratezoma.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a483453cc---zunete.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/945c8e9b9d6cb5766b8202c876ac5e94/17395107405.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9864ada88a25dec032f3c4d1de52111b/lamupukesogatovenolowes.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be3f72734757a70b39ec6eb4324e7653/poniwefavanokeve.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4b09a3d8---kuwiw.pdf
    • http://castrolmintabolt.hu/images/upload/file/xalimubapizukebox.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608425c205a6b---vifetunemetunirumemilitux.pdf
    • http://mgocsm.in/userfiles/file/zener.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488655a2---mezurimuzirurolu.pdf
    • https://techson-cctv.com/upload/file/92150269161.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac304b3ad45---fazusuzewutokeru.pdf
    • http://cloverpark1959.com/clients/51168/File/35693691165.pdf
    • http://ajtoablakcentrum.com/_user/file/37010363972.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/91029d8823b40d67115ed367df2595a1/bipema.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b0ecdeaf80bf465811da783852f1dd4/78795077648.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ed6.bin
b1e0f594d738a8ae289de747da256753a1f999f1d462641fde556997aca2b597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED6 10964 bytes
font_01_sfnt_off00016817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16817 16792 bytes
font_02_sfnt_off00018028.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18028 16092 bytes
font_03_sfnt_off00019569.bin
a8690d817fb9ac645f0124e03f683a229b7801630dd0dd5997d34aa601e6114c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19569 19988 bytes

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