Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9b752bfe97749…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 13:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c958ab6fb7a876b97c729b78ae68190b SHA-1: 00763262900bec20162f88962c59c58498271df0 SHA-256: 33a9b752bfe97749f150fdcc4bb2e36093a554a7549d88f8393eac8ba8089928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=mercedes+benz+glc+300+user+manual PDF link annotation
    • http://ofipapel.org//ckfinder/userfiles/files/lonemazefipeliwoxufadugob.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5785305914d112445664544733a97db9/wexafumisemejozak.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/vulorenuxugepu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a687698c4---doxolako.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/6369217902.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/16514857856.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ec611401f---favama.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/zevesatesepid.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/14197481749.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc1e00ca7b2d5805f01f41bf27583900/67415410882.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/keganovisaz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfa7bd3394---pabuvaxuxovagosisefinamuj.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/45949433343.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/9210899324.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/niredukesaduxota.pdfIn PDF document text
    • http://amkchem.com/upload/files/57953779021.pdfIn PDF document text
    • http://jinyezi.cn/upload/63284185811.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/gixonesedeta.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa219315cb---sawopozamo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/dibadika.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8f68549b---57754124451.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/xorulokuvopasiwujalozoluk.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0beaaf3b---mexoxobivuro.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/18011546461.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f462d3858---58107169695.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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 16716 bytes
SHA-256: 168b10c249197743f3989eb1ff3b13abca04bd2e261c8f565fd0d9eff008cf75
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10992 bytes
SHA-256: 76953a78e62639a0226ebb762e181eb56815b37cb10983d7e4deb72bff98d95d

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