Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bff48f8dce0440…

MALICIOUS

PDF

112.4 KB Created: 2021-08-15 05:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3b108e9183199d2131a9e47901c21c31 SHA-1: 80809cf03d8d5a5492bb3665a9b55d61d31e5a40 SHA-256: c2bff48f8dce0440c3d40ea0829659154e83626bbb732f7949d66ca7f943cefd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5618

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb13097196---rumapidokodefekezonu.pdf In PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b18985924c03c557560bf6c7031bb6ea/88686445733.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60663503273.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8652376732---sozozunitukitefoniz.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/pofulozever.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf4ac76ba---dizatabi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/62764619791.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/kimofaw.pdfIn PDF document text
    • http://cochemical.com/upload/files/detovadilalobosezok.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/sikizinogep.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/78866391135.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621222952.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4f5bd4da769cc2813f42726ab79dabed/95112655010.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/75182537928.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/12808044110.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c216bdb3---16013636959.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/dolupuzi.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zatizatefadawi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/74503952162.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609384417ec8f---zudosadulaxobonawe.pdfIn PDF document text
    • http://x-mobio.com/upload/files/bigujuriru.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/73abc245ab4e7047ce4187ea3a562e95/ruralatefilobat.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0251cb71e---subemaralisekipikojivuk.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/066304ca5dadae3b7acb18ed2fb2c2eb/sujojosuruluzenozalomiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=majili+tamil+movie+download+tamilrockers+2019+isaiminiPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527C 11360 bytes
SHA-256: 0c8db42a76e01b10b1b03cb2571a4f736a0e761e59e80cba7541cdb208228700
font_01_sfnt_off00016d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D58 20700 bytes
SHA-256: 2c199ea432890838ceafa14ba8fdaae24c68325e42f71550d83702c51a973433
font_02_sfnt_off0001a388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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