Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69599268b8889d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-22 09:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d6561c4d1512ae0034d78555d881877 SHA-1: 69cae940190a75a6f734f0631a04afcdea6d55dc SHA-256: 1b69599268b8889d337c97fb4ba0f8ce8df644fe99e434b90db2a11a8f7bee20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=square+root+values PDF link annotation
    • http://finadev-groupe.com/userfiles/file/bodamefimijobuzibikiwug.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/31802075137.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/ninafulavuxagexixuni.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/503b0de90539a07e23ecc93ae8affa83/sulelapogugijunip.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/gures.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d7bce9934e21e62881372c1c8da28431/jajikejobelit.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/17982808819.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zibemujudurizoxis.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac922dd26e---dilaguma.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/39120361750.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/wumatisataterapikezuxo.pdfIn PDF document text
    • https://shevian.com/images/file/2925353260.pdfIn PDF document text
    • http://axwelindia.com/uploads/36756945452.pdfIn PDF document text
    • http://villkasz.hu/editor_up/vixosukuvokamak.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0948145001631804956.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xenofug.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386d1ac9234---77816148166.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/24195731370.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/25807760393.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/37739712910.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2781997641.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/jopujo.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jovobukavoxememetaseraka.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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 14048 bytes
SHA-256: d89109f7cf39a3de87609ec743124dbe66093b6fcdbcd18858a8178a7e0684d1
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10292 bytes
SHA-256: f44a22596fb241be3f677005ff68457f30002ef9f2d9da275a8b2cbfe037571a

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