Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4749f619f7a8f97…

MALICIOUS

PDF

82.1 KB Created: 2021-07-30 23:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 84919f02ee5285de04207b8b9865bac1 SHA-1: 2dd520f0bb3fc319abaf86661834df14ffb22c2a SHA-256: f4749f619f7a8f97b4dce037bb4a5f367ee5236144aabd1678c2589d662ede86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c61782d9---95268420007.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sj9b9a9hvr2gp6hmdqoi0fb2fs/88593893900.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/tifizuxejidisilexelixos.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/25386053921.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/futazobo.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/92045673529.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/48255326356.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/v00f7ftrg58ild8v339omvahg3/lizowukawunofuxigawira.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b1deffde---59549590038.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/04986c12e27f47731b1aa1726e011252/19388594329.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c4d64808411e03420f238a4eaa132680/bafanulizuradanu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073468dc5d61---43006742650.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405ae1543c---numedotebipofatog.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609881e932b74---kisuvudixofenivegomalob.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kelebanutep.pdfIn PDF document text
    • http://rayer.cn/d/files/86811480108.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/63167035348.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/86465516110.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/16823827723.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160870b9484c31---towidemisavoj.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/mifakirumofolozowixinexu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/c4sui318uv4o9ov99orkd3cpn7/voposimiba.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090d22066ba2---76075652809.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63803b595---86067083459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=characteristics+of+living+things+test+pdfPDF 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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 17100 bytes
SHA-256: 8de9d0ebb35477acad9c10d683efec70c8350a63cd48cfa09eea83cd04381e82
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10996 bytes
SHA-256: f2e58c9ae507331fe6aed5f0eb8786347efa68a2ff9c2469ecbedb7a02ba0ec4

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