Malicious PDF — malware analysis report

Static analysis result for SHA-256 312d9193fdde03f5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 15:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdf79d9d54b8e40b66b58a695776fd54 SHA-1: 395f809ec0405718401fba843621fd2fc57633df SHA-256: 312d9193fdde03f5feaf8a5cfcdf38e86901d6abd0a06fe5ec18744ca62be96e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=town+village+farm+build+trade+harvest+city+mod+apk', suggest a lure to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=town+village+farm+build+trade+harvest+city+mod+apk PDF link annotation
    • http://rafaelstore.ru/upload/files/dedofugidelobatikaxotizep.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/bajanexobimowewuki.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/gegibidifegisudebu.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/43696403618.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87960585404.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/63540436232.pdfIn PDF document text
    • http://www.polni.si/Images/files/85480451126.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b03fdc44f2f4d78afba4d7fc71ba9893/49033882080.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/32573495331.pdfIn PDF document text
    • http://vaynhe.com/upload/files/33265630141.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/2015518951.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zejivifipapi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ul0b2frhsotbtk8hqk7ietgj87/fivazugirepuxevobiraru.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/vimafepuvekudovaxodu.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/63068207944.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/88493447848.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pepekisezaxudanobim.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/95220453097.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/10748635421.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2653h17cunolqbtrc6pl0jgmi2/89660932852.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210910_5766C847DD3C5DC1.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wonezatomika.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c84a791---jexupitoxurevivi.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/59354799764.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_off0000b83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 11628 bytes
SHA-256: 4dcda72bef6a52fae91ccfee184d5d54ccf4e611a8c1489a8548712b7ca507dc
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16436 bytes
SHA-256: dd62dcbb3ac3c9cca05ce11e077ec5650f0b47b3a373e61891c515cdd73a5f75

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