Malicious PDF — malware analysis report

Static analysis result for SHA-256 547d2666abcf7383…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 776c65199a8f8891258ede63de74ffff SHA-1: 4e4ab9bbb8eac728b634267b77668d8cb79e4828 SHA-256: 547d2666abcf7383c719dacf4d96331255e1cb0f4a4a356d15cae792fc1d09b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm nature and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cec-intl.ru/app/webroot/files/file/62509591844.pdf
    • http://haniltm.kr/upfiles/editor/files/63033686399.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608413f143ef4---totefemopufanogi.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/o9of5lkhfn0b989522de7lc230/pavufukupafaj.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1c2e189a---dojejapojekewama.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_E403D35C373DCE66.pdf
    • https://szabobuszberles.hu/files/files/ramas.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2anauiq73cofackf2b2sluo605/40143866270.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/45ebe3f9e074e5f635a9c6b05108c797/gegosebexok.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c1036d7e9ac86d962c47a0c94576ac1b/69684746884.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/neviduladiwijagudutuxi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b40b87508---fonupojonu.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c19f308f---bowel.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9306f972.pdf
    • https://takipcisec.com/calisma2/files/uploads/jejiwisak.pdf
    • http://nomaquito-travel.com/editor-images/59377648798.pdf
    • https://areicon.com/images/file/refesosesubu.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afd634341---kudasajobivewomigiw.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bnn0tuup9ga6445kujbp4at802/88199196057.pdf
    • http://uticachemical.com/files/upload/files/31432917018.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fb6c66990bac711974ce5c19a31423dc/febalowupozikezuxumim.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f028c6aeaabdfab6df86b4c49bbd81db/87759618479.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ec55e203---dujox.pdf
    • http://tcsm62.org/uploads/news/file/xesunojisinojileduzo.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad785a9018c2b9420b5f943f60635929/rijozuxoruzijavi.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3shh8meukvcmaf43d1gb1755b7/62840860184.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=catch+me+if+you+can+movie+worksheet+answers
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bac299f3e45b5c3a796361e70a227c7f/80049440014.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_off0000f707.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
font_01_sfnt_off00010f19.bin
8ce4cd40af674161490e59b6997ce1cf8002eed3a65c23a97306c6236844f60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17760 bytes
font_02_sfnt_off00013d09.bin
1fc50dccab67e276127b977be61f89198335556ac552bc7e33f3b057cac5e198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 11044 bytes

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