Malicious PDF — malware analysis report

Static analysis result for SHA-256 559ed282f1b8a0f4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-02 15:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a753ca7eabe11778ed8a8486501a9f25 SHA-1: f031cfbbbf9b5dc89955b234193cac547257f56c SHA-256: 559ed282f1b8a0f45d6f9da203e155b3f26554ff63a2f625c04387cb64a70e86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=magic+e+worksheets+grade+2 PDF link annotation
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/89118256270.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/dawawojuxurovufinifutaxo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/kamenujagopelamile.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e1f236b7---1351766184.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/dufoboxug.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7ad76e78---71828257174.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/koreml2fhpptfkenflmvb9je46/nogozixis.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6559e8d4d8---topodetixuju.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/15632016808.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a5266ee3---pupogelemazeluwapuxozeda.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/66387969634.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3f180059ed2e956ceaa6ddca16ba09b9/84321621552.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c9cd0d94---93448123152.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3565bd5b2efdc55178cb1f759754ef9a/danonexovaxugew.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lasurakoronugazokad.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pifajerivekak.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/82493454560.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/puluburig.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16121c93ba3ad9---teliponavaditisojoref.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/27320245366.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c5825f8d---muzabekigenitinixod.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wolesolufafosig.pdfIn PDF document text
    • http://henca.com/files/details/file/zofizugigodomikutig.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 14648 bytes
SHA-256: 833aaa14220c60622f522d760323e92f1b09df7178634efce217446b4f42ebae
font_01_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 10788 bytes
SHA-256: 15ac131cc3bfe95612593e8e3ab62381532cb92cc71023fce921ec50c9c2ba04
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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