Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0c3c7ccd6c1f98…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 08:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fbbed12b90877bf552ac57da8da6683 SHA-1: 86962dbd127515510bd439a4537789a50a0b28f3 SHA-256: cc0c3c7ccd6c1f98287ca6fb811007f51c80f31c49b5a419d9f2413794a081e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt users to make a phone call, a common tactic in callback phishing and tech-support scams. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=can+you+check+who+viewed+your+profile+on+instagram PDF link annotation
    • https://textosl.com/upload/editor/file/rorabolaponajijalejim.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/67366676526.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/58519317720.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/figijijibogo.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/xexaponagupelek.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2459e12700d6fa06becdc279c7a32da3/71103822789.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ralapimo.pdfIn PDF document text
    • http://vln.nl/files/file/sopibibakiwapifi.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wejotigatitevokogap.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67309481403.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/26056803825.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zopafagunatirigepolanufu.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/gigerozo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396e208537c---tilamowitotezunugogowa.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c3cd6b46ff9f7691a319cfab644de977/rizasosazutavixabijidomos.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/ditobeburozoku.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbd51e16f---55240407024.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/xedalawara.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/3966213521.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/nurivirunuvelulixalozaru.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/9165121317.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/gagijipimirifa.pdfIn PDF document text
    • https://timminsrenovations.ca/file/3HpEtHYNT4RdSERy.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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 16000 bytes
SHA-256: 9e7fd5b93a0c2fa99a8ee420ab647862f61570c3fe0e0a5f5a9aed9877778636
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 11556 bytes
SHA-256: 7ba9520ab4cc3d128c7ce6bf82bb71a18ea47056e7eebd20201893c0258bd3fc

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