Malicious PDF — malware analysis report

Static analysis result for SHA-256 779aa20dc0fa88a7…

MALICIOUS

PDF

74.3 KB Created: 2021-10-02 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 45ae857e9ab53a9fefd48f889935bec7 SHA-1: 679dc90ac5434c897d59720c0ad2a002c86d9c21 SHA-256: 779aa20dc0fa88a770151917dad81d90a4930bdc930831431db4d2dd4d50606a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ijpdua.com/contents/files/gisobozigenuxe.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/tewase.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1b164367286ef80b7f5d5478cabfe907/40146839513.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905044847.pdfIn PDF document text
    • http://modero.vn/upload/files/sorirorabadexes.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a79573df---58568174403.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/60470735054.pdfIn PDF document text
    • http://thedreams.cz/files/43217001986.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/41517263540.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542dcdbc548---geparipovaliru.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/30162708550.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/18fc36bf3261271f0b258d8ce38d5719/kadorakede.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/42101489619.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20211001_045256.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/dopikevubobowolilozugala.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/98052415957.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fezeweruvopusid.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20211001_73D7A0A1E3186DEE.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/66642773400.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/27054275995.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/benodepelipupokulazovak.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/ninoximejadoredevi.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/22606134258.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tevetasesonisabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=come+scaricare+un+video+da+youtube+con+androidPDF 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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 10936 bytes
SHA-256: af8f2e116d1bf6334f24e1c33fbd1dd5bb417ba0d5d9c31139b587d76660e35a
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 19156 bytes
SHA-256: 51e6eb0cd5b6488d4a857d7749a581077cf6c7ad5c7f6ee765ca72dbb0f9d7b2