Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b5d41dcdccafe…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 10:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a242f417093539a66d23f999b7e314b SHA-1: 09097b13a6d56467ca52deff81c9594bff79c83c SHA-256: bb6b5d41dcdccafeb1483af329869c93091cea7880e5744273976ec1feea19d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing and trojan by ClamAV and ML classifiers. It functions as an image-only lure, presenting a screenshot to trick users into clicking embedded links. These links, such as 'https://infrive.ru/uplcv?utm_term=the+third+one+full+movie+watch+online+free', are part of a link farm hosted on compromised or disposable domains, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=the+third+one+full+movie+watch+online+free PDF link annotation
    • http://cascinamana.it/userfiles/file/babetaxisoxexosiziwiva.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/90997196460.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/safotef.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/taxomizul.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/dizowedol.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147194880628---26667331809.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/gurorilivem.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/80070485774.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/kegevavuzokipijasetupa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/foborawemuzafut.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/simikidegofipexuka.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbe3c5769---7017347032.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/18460272662.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141ea264d82d---wagavulijaz.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/mazadiwatofifomu.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/37148969522.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/81385594582.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/44227681563.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/pupebusurekexid.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161406fb60dfe8---68567799680.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/de7b7baee5e9f933820f7707444f9521/67623723458.pdfIn PDF document text
    • http://rafaelokazakov.com/file/10646788665.pdfIn PDF document text
    • http://congtyvima.com/images/Download/26536843667.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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 10788 bytes
SHA-256: b34c692f6d6003febf6bfc9d18089c211698500a9a55a108dd26741eafa26cc6
font_01_sfnt_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 14356 bytes
SHA-256: 7305e6df5479117a69f447560dc9a0fc186fcc02068f2e537d9ebefe2dc04162

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