Malicious PDF — malware analysis report

Static analysis result for SHA-256 c667fe7d86027601…

MALICIOUS

PDF

79.6 KB Created: 2021-09-24 06:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f598bb3dd8e504eecac5118dd5b35e0d SHA-1: 3ee2ebfc65b3190ef1e1576244b9064b532cfeb6 SHA-256: c667fe7d86027601a31da385dd5ae93cf0356d5ba1312a66189e0daa0de008bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious destinations. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://decaiyun.com/upload/file/210915153258368590jfgaotgytyce.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/libiwopaxufaki.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/82365184431.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/17954741607.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/66610374354.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090816385694104981insir4d672.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/pelamodexuna.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903120123160.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/nonugepakefumiguwusejorep.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149321feaf79---darubuziwajimomadaro.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xegikanamixipi.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/fujubufazikesugevad.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/15122017914.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06807d84---87936871443.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/xawusuvasifojokuvakozake.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/70487682642.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gfm08trfclslpq7b0i77ci7bvc/dezuvorujufidiremameja.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/dowuvavin.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/wudanilegebezalan.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/63922076522.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148d352ef2d1---somijaviwemewerorowoduw.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jokedilogavefifajipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+phone+sound+memePDF link annotation
    • 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 18796 bytes
SHA-256: 09651d65fb13597b2feb8fbdb488266c3c859255344e8f896e400dbf4620d728
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10432 bytes
SHA-256: bc7a7fe49ddc32eca331edf7c7bb7b3db8318faa84f03dc5c7282877bff42845
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1