Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc42735c9f7c80c…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 02:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 136214e1dc019ff12ac528cfe454fa22 SHA-1: 01a3dd669870e85e4309520bb31db64dab54ec7e SHA-256: 9fc42735c9f7c80cc3cac72e0bc614592fd5064de3f7bacfeff817976ba0ad53
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, indicating a link farm designed to lure users to external content. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of multiple links on potentially compromised infrastructure suggests an attempt to disguise malicious redirects or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c7626205---jimuvefilusekemazelux.pdf
    • http://misspacificus.com/clients/873634/File/88166191299.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e36edf763aa924c219bc8d4b4952b576/zoliduzarowubofidomiteje.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a457e035283---lonavifakumesumonulozuja.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/696573e7fdb507cd3aa86a80cd68a423/26499069268.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077137fea42a---zekixusemilapufuluni.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f66bfd27---13284234991.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083039282dd9---81965386376.pdf
    • http://ahkkpcm.org/userfiles/50678310163.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0efed9aa87abe2ef986a55826a047fdf/83233411760.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da967fa89---19120392547.pdf
    • http://tieclangman.com/Images_upload/files/xoreburo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160781b0243d99---19204391529.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3e0eb0b66738da61a690b11eb478797b/xazolafijebejazaban.pdf
    • https://ost-fogging.com/upload/files/14568681770.pdf
    • http://cesishotel.lv/res/wysiwyg/file/finedemokewulovagad.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa1be2b0b---36541961091.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1b6igboss39m933o8najdvvf4f/tuzir.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607962df6b602---viwominako.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728475e75c---sogelodoxelulenumular.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/35281624333.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2a2bd0fefd08019838d7e7073f2d0df6/71380665207.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rrmn2no5pds8sa91f2qlat8t84/vosexugojufuxejepedi.pdf
    • http://londonjip.com/userData/board/file/12435798602.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/27892458818.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=example+of+gibbs+reflective+cycle+essay
    • 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_off0000f157.bin
55d4bb2e24237120c557701f39ceb872b9ba7995f5fe3dd8e441478b06f0bee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 11124 bytes
font_01_sfnt_off00010b30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16792 bytes
font_02_sfnt_off00012342.bin
197cef54f1837601b14cb645877c28324a48451ae4d135bdf194081fc532a080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 17208 bytes

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