Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec745d4211e37e0d…

MALICIOUS

PDF

96.0 KB Created: 2021-09-14 05:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a04e3598751e3b2f398257891b622b4 SHA-1: 0d158af5834905139e4b7054cd2bddeaed0b332a SHA-256: ec745d4211e37e0d60a6423f46d99f67751fad164d202e270f33b25d73c620a9
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://philabc.ru/uplcv?utm_term=power+supply+unit+calculator PDF link annotation
    • http://chongros.com/userData/board/file/46461995542.pdfIn PDF document text
    • http://labonscafe.com/userfiles/68008699036.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tipaxoridunawabifetasiw.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/4913575516.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/58255873887.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/lorajuwezajorug.pdfIn PDF document text
    • https://fond.ru/userfiles/file/nisepegufozeneja.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906071840406.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/879049196613253c898ad7.pdfIn PDF document text
    • http://erpos.sk/data/files/74447890639.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/nalujaxudokeledoz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fb4a7896---59260336420.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73138869178.pdfIn PDF document text
    • https://jss-moms.si/upload/File/34599105400.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sadivuvujelozosamuzi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k2jp4s00lk92f10umtts0humc7/ketotamalagedupaz.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/50072858457.pdfIn PDF document text
    • http://abwrva.com/uploads/files/86106778277.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/14028118346.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/79786102513.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/55059777252.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18776523295.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/52203823340.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/27102892224.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613163bb18623---881447662.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e505a91---benejum.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210905_0A6C070EB54A82D8.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_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 17944 bytes
SHA-256: 760bdad2c2e098dfda5f4550a602259d7669f15e5bdabafbc8ee6570bc16eb57
font_01_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 10668 bytes
SHA-256: 395e2ea311e8023d26782622ed31fef2bf7c2c5f56ba125d3d18360cd8c0f7a8
font_02_sfnt_off000159d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.