Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626fbe6bccdf952…

MALICIOUS

PDF

80.1 KB Created: 2021-06-26 08:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c7551dc05b5353f9d600ebc6ec58ac2 SHA-1: 23056fcfa12b03fd4566be4e8d0cb004874e0d1b SHA-256: a626fbe6bccdf95276332dc3301a7ec2009b2bdffcf452dfefd9b976b65489be
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of these links indicates an intent to redirect the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://evola.it/userfiles/files/57081256735.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4e20cf926069d60878b9104ebd7ac557/lobelusiweziz.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c314c9b2---duropir.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/d3a10a7d22f98f00e3bc66993efb9afd/rosutilagatagataxovavabu.pdf
    • https://hirurgija.me//files/56215290448.pdf
    • https://ntct.dz/ckfinder/userfiles/files/kizelo.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d31982b5f---62334140524.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42658df0bd---61949679643.pdf
    • http://cec-intl.ru/app/webroot/files/file/doninodixanuweladawet.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/17924971945.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a9426bc6578---lulinegotidepabudoj.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b18bb3d5c---75428736089.pdf
    • http://mwflower.com/upimagesfile///xagoxadefos.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/11ni6pg4ig6kb07oieb9g9pv4v/dawodojibazumek.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/potazewijegukije.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e48c475fa---41688105325.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/u995hs4c3jrr8h16hg93igldo4/sivuwonixigitewizakipelu.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/27126364619.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e03d551c---mifigobokawizevoj.pdf
    • http://anandtouristcorporation.com/uploads/86950009106.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81feeec2f3---37367417354.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/11021973522.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/stklroa6cbgq3o4hf1thirrvhm/31534386987.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174570b3d2---kiroxanoxew.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3kht8e2p6fqtb33vs5bf2vcpf/45651123120.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bf7e819e9b4887edfbd6809facd64ce4/33941213159.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fast+fourier+transform+ppt
    • 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_off0000cb65.bin
df7f8703ec0a938b1010c509dee419a66875cfb4b3f3cd4d2afd649ecfb9a309
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 10548 bytes
font_01_sfnt_off0000e36f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16792 bytes
font_02_sfnt_off0000fb7c.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 1636 bytes
font_03_sfnt_off00010349.bin
e7191dad1f964d7dcf47a39a1303d90c3b336769047dbb538fe2d467806248ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 18224 bytes