Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b65f8b1dc421859…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c68e5b70d4514a464e2e63fa34ba96c SHA-1: f5edfb6cb13efaebe2eb6fc90d45f54332e30b5d SHA-256: 3b65f8b1dc4218598680e7d51b5af08260851b5d28b7ef31f305d26db7da5bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various websites, many hosted on compromised WordPress installations. The presence of embedded URLs and the nature of the link farm suggest it is used to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=bmw+x1+2010+owners+manual PDF link annotation
    • https://mongolia-volkslift.com/uploads/files/70777202285.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d89ea3ac---wasofopi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d9uerhmg76ha2qo2h147l5qrk0/foxipinedorusarekewa.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/68549092007.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/wukesuvesakegezudumute.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d24b108cd---37856996757.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/33473524876.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92431bd03---rawameberiwawaveta.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085869deafa7---dojujugej.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/fuzodaruwakapojuwi.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/kerugelazoxavowekapuv.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/83284302282.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070100e3574d---23168271506.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07609d733---15621803498.pdfIn PDF document text
    • http://rajakedua.com/contents//files/pasomavosub.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/b9bff0692cb3c57023eae40707aea89f.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c29e99f0ec8dd5bb5963c54dfb80b19e/68042479943.pdfIn PDF document text
    • http://kunbot.com/upload/files/taxofujuwitugevipago.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/xitojijojufa.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/99533747385.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/sudegoxaxofesabagu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0407659395---xedenuruguzeb.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3galn6kqb69h4g2aa90d3nc9b0/mudibapesixomemigolapuwe.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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 20404 bytes
SHA-256: d5546c73aa0320493081bd7cce667853d4cd16f06d3ba0805474969c6b797795
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 10712 bytes
SHA-256: 248709c911a38badfc9a409556bd6abf99b113f34dc773a25c1f323e519dc7ea

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