Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7b2117ac9285bd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 04:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e33e58a849f0382d39af780f17b6d35 SHA-1: 56eaf08ca865d0a116e49b7a6a67274e3c513789 SHA-256: 6a7b2117ac9285bd062a4a9dd409666f64ba5fbacb25cd4dbb2b4f09cebb2239
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or SEO poisoning attack. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://recko.ru/ckfinder/userfiles/files/37469326418.pdf In PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ea5dc896868fa8590d07f04ac25ffa8e/jurivuto.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128c9dfd9b---81989740328.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b96b76f0---rofenaxiwu.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/63475244490.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0ae6d726---3222452363.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zuvaxu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96663f458b60eb5b2fe54f18993cbf8e/dezigirogivolawobefixu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/89518799455.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/53256433409.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/62517280956.pdfIn PDF document text
    • https://limsurdua.com/contents/files/85726221628.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/83623290159.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pofolakogazojatopotani.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tubovomutav.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/penapituvabe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fa0890a61e8c9f87f4c489994084d4d3/73156767143.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/20246921886.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/23112449842.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/nefudivasanazux.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/85318267980.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/xorenikaxakewomazediluwo.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/21525711241.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/noxir.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/momobunamolus.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae01ca01f---84057708144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=world+most+popular+android+mod+storePDF 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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 16028 bytes
SHA-256: 52f014a29654f5f643068fdc778c891f571db628bdecb534dcafe2dbe117daba
font_02_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10648 bytes
SHA-256: 1b64dc2c751e22de82cd190e3eb3bccc3c53fb8514a04c8e0df9de5c936d413a

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