Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c516825e17520b…

MALICIOUS

PDF

76.1 KB Created: 2021-08-27 05:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e700cc2998b8a1957c05997ef2fcafe SHA-1: bae4a340288f56c4bc157c9ab60be157c9eeec6e SHA-256: 39c516825e17520b4d42cd1a2a41a44622cf71147127ed636f88c920822ae397
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=piano+see+you+again+notes PDF link annotation
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/881dac672641ef0b0f02682d54fa5e4a/86713125183.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/13988345408.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/buxado.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f956c7bd609---65853010716.pdfIn PDF document text
    • http://demkapi.com/resimler/files/linafufozovagofe.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106270618554434.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/pegozonazadafisirujepaxi.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/95711954443.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/rasezolawazir.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41f2d5181---zuxolomawizemamiwozaki.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d0eba332---xonupiv.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3d2dc4c8bbf927d2728036426c74d489/rinunin.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/57196304266.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/bexiwo.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/lidetexebunader.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610faea66604a---reviwigedojemunuwakopi.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kibalanofewopeluzutetixob.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/wewuvutiwenapikurixutemor.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955219041f---kikugawamujitoruxuk.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tizonozewuvop.pdfIn PDF document text
    • http://darstin.com/userfiles/files/teforabakeg.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/malipofawuvik.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/fobiseragabezutokoxufotus.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_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 10352 bytes
SHA-256: 6e6e7b2dd2e802eafb4843a2cc7fbc57b53c296c94179065c04d4782f35a0924
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17236 bytes
SHA-256: b6a115f47a08b8e1801d8979599d74158a7887a01b231f8a9d0069fe51f080de

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