Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bb9b6d0efd20ad…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60a478d720d5068cacdf2c4319d252e6 SHA-1: 2ff4f9ee13dd5963dab76e413930e39935021044 SHA-256: a3bb9b6d0efd20ad3ebe99dc6f259dae9e413eb51c5b1bd01d68b3fd8027a4e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites and utilizing UTM parameters, suggest a phishing or link-farming attack pattern. No scripts were extracted from this sample, but the overall structure and URL distribution indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=terra+nova+test+administration+manual+2019 PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd381d14e23---906587802.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adacba46f30---sedudomidenakezeporo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/morurumobivenirop.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a132a09412---3433120136.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pokotiketerutubekewesaj.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/30155275504.pdfIn PDF document text
    • http://www.asslar.de/downloads/lamevulo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a59215181---revatovusenalowuguzemigi.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fuvoxilotujan.pdfIn PDF document text
    • http://dhf-china.com/d/files/18159625838.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1c682d21---saragalunifuzebutoxodu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210622013803_1503362797.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/6017511655.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fujupitizenimaralunegi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • http://camonetinternational.com/files/file/gotakaxilupadusuke.pdfIn PDF document text
    • https://brickzoo.it/file/8335179508.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072523fa77cb---55554004870.pdfIn PDF document text
    • http://uhorder.com/upload/files/81521457264.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/13330840302.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/69756134754.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///65499848239.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/72734959172.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/oa428pmv9auvm67kd4tqr9o7do/92311419801.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/8568082581.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 11000 bytes
SHA-256: 903145424392d272ac247a3682327c13826a19d2070c923dcc238198abcccbfa
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 18804 bytes
SHA-256: 09a6741c0ed39142c7c95706a2aff344e21a41d330d4b99565cb400c66edaab7
font_02_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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