Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc798d6d6b1759fa…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 08:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc892249452bd4d379f648f50085d724 SHA-1: 4e63d9a909bc6057156626522af77df63e34790e SHA-256: cc798d6d6b1759fa48447cec09ff6f44ef212eb875785b8e5cc3819f6f9c95c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary function is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=microsomal+lipid+peroxidation+pdf PDF link annotation
    • http://kimhoatra.com/upload/fckimagesfile/bafovupo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3eb7d488cfe748e016f76420d2c37187/54327229680.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/nufawuwojesesuwava.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/43361789373.pdfIn PDF document text
    • https://lojaortigas.com/ckfinder/files/76883240191.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/48990987672.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/32889748680.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/17189104321.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0651jfsfsu5l8fdnsha8i10ish/76100734492.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55713894690.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lowudidosozidomajodezor.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/16919021588.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd5f28d9f337717406db24c4870ea1e4/bisimatulosowux.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13775327---lumozezositetujevaj.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5e78b1da---28863678008.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a10249d6fe1f1dae26dd9efaf328e957/28722205851.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7907372388.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/23135596298.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58574546647.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea72a2d34---wisili.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a29ddc72361---sapenas.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf02b98d3a---51352190243.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b0edda176c6---87785015681.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vp26uc08pbdk6f433aglgogve7/98742992094.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10876 bytes
SHA-256: 7a39b1769c0135bfb50221b36282cb9f1a6fe41c5d78a77c58081923581d6590
font_01_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 17372 bytes
SHA-256: 40451e39e175b78df5d1a82d099b59cf6cde031f319b22361aa2931b25522914

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