Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33c7f225322612…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0273039fdb2dffee6e1f11532a36cae1 SHA-1: d150758ff4bbf0d1a837a18a56807bdb2dad4b9f SHA-256: ec33c7f2253226121e9f63287e14f62dbb3671f681a637984e0971bc10a26111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=d3+witch+doctor+build PDF link annotation
    • http://timeyear-v.com/userfiles/file/53763625961.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f64a2c3b---90662018207.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wulipiridalila.pdfIn PDF document text
    • http://hongdacable.com/d/files/3259775010.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/bunilo.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/82178264133.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/naxat.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a7c76a9772c63062e3ddb2b707e2eadc/nuwojowelefadijorixul.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/vogomi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k3lj71aa5l2efuurrlm0ubnegi/83550840209.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610516529777c---74406407247.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/donudotepipusewedel.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210825034613.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1629889191.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e053818---13645764864.pdfIn PDF document text
    • https://petala.gr/userfiles/file/fofis.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/40096234132.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/37227857400.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/lomapira.pdfIn PDF document text
    • https://kermanrooz.com/img/files/gagule.pdfIn PDF document text
    • http://sun-eko.eu/files/file/13589079887.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/27s9un69er0099sdea0rh6t1s7/16998935073.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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 10400 bytes
SHA-256: 14523b8ce0d7d6f460f7940887b2909909db2ba4feb8daaab41ddf21abc024ae
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 18056 bytes
SHA-256: 1927d684802d02538d983a5aaefcf09048a42fa1c287ce8057f77e165a648e5f