Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7ffe50cdeaedf2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec33d35c1304822ba3499d2c3e8fe675 SHA-1: c1e45557491e9be3513187e22a591358454a12da SHA-256: fb7ffe50cdeaedf2fc61a29c85c926cf05fbb0f2a2fe97bd93443600587eaa95
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sabagdasarov.ru/upload/file/70350892686.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/20391374255.pdfIn PDF document text
    • http://allycatering.com/userfiles/16431661137.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/60271189713.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d3d8d573ac0c7c635c58f2186cebc6c5/18431248605.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2g3cb7i5rb3bcnu1eqssv8prsk/tefarexumipezarorefava.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/rekekapenijog.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/geguzinodadadejokaj.pdfIn PDF document text
    • http://videlec.be/ressource/file/kokadisusuzeboxid.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/85691362956.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/39995607118.pdfIn PDF document text
    • http://teraval.cz/res/file/fasabubu.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/48702899788.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfe5efe66---14273802609.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfef40e0e1b---xesevawekunosurejesigopo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gepugisemefepinoj.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/luwamabatep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3694208c89---pebapagotodomo.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/26871106298.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/10007583571.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/41ksi4947jgvo4famufio5bqdl/18085103034.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vo281epib7agv300lksr90u4ee/97551437753.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d15d0668---3237299223.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/36855202852.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jevozerozipepupi.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nomavifisurabam.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/70657752434.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ropenerawufosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cannot+copy+a+worksheet+in+excelPDF link annotation
    • 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17808 bytes
SHA-256: c2c98fb637c0a6cc6d9accdb39c5aa450cec1cb9c5b7d0daaa49b32666dc9254
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 10896 bytes
SHA-256: 6c6dad1d29d0d747f7d20e7c0bfbd496a841175ed12f9c301f29e491d51e0bf9

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