Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc159428e5287aff…

MALICIOUS

PDF

83.7 KB Created: 2021-08-02 23:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6f9b4dd32760f4265ac288a825c4208 SHA-1: b20033b2f060e4b9bf8031fe2f495fe5aef47811 SHA-256: dc159428e5287afff89ab34e4caaa68e2ac948241af0f8e6b1bf99b86f5393bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=bolo+tara+rara+full+mp3+song+download+320kbps PDF link annotation
    • http://seamcc.com/UserFiles/files/liwabup.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5c4c0be6e3f7298b8b59275725e17ed2/51724214104.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160eff24e7c931---tirewuwapolepilevuz.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/bebimatudolajaguxajojon.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/738fe2c689fa753fa7c46c0e3127bce0/maluralafelaxazag.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/36958674401.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/60172762788.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/tibulilunurozexokoloredi.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/wiluxepigo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87406a1b29---tesidefibadodabefej.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/33039333307.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470cd2003e---12925696923.pdfIn PDF document text
    • http://klefmarken.se/upload/file/1991717281.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bda8cdb9---pifagukabifo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/xunamimapewinosorivatedur.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4793acf---tinatezepozanajapijipitim.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb96ec455c---bimazezigok.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/79872359161.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb3c93055---zerazaxasonijologovip.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/27354ac510613085df9df03e3081809e/85811335794.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d195fdc1---zovavemejaki.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zesufajizunu.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/52945190922.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/49d8379e56c950f24afb987073e0a3e0/vovuxulexoraj.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 17396 bytes
SHA-256: 3d7f4bff92a1e9a822683c524e1db1bdf2d444df15e54d27a29aea8b7d7ff65e
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 11504 bytes
SHA-256: 58c5705de87911efbd28c1ffca180ae7db290fe8aa70de31c5cff36e2193bf8e

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