Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c650c2334dd2ac7…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32b9947d8038e6b376061b8f2edba9a9 SHA-1: 4c827c686cf8e20841ae80f7b9b55d8cc7369598 SHA-256: 5c650c2334dd2ac72d16bac69f6a5a0cb2fca9ce95fd4c7ee8e9725c99bb9009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of compromised CMS upload links further indicates 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://pixomot.ru/uplcv?utm_term=mi+tv+showing+no+internet PDF link annotation
    • https://cyberbirddog.com/userfiles/files/gaxixoleg.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/96991915085.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/gakumolazif.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dogilozopixe.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/35f809336f526cb42e8e8188d963ee89/34131331574.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/rinatoj.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cb27ecdc6521261e73b8195bef09ee5d/mapewed.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kowise.pdfIn PDF document text
    • http://e-hematologica.com/users/file/75795805146.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gujotokawivijuxunen.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/96485233599.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b266c76bd8---nirugi.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xumitarotaruvopa.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/napiwubujapevelasojebujeb.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/foxixuwerudeganutuvakixo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ralujoxasegisukenefuxudow.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/pupagoliv.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/radagetomig.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/dobemoxukirikopuwa.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/2072162306.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/94492590495.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/52750784040.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/60400338954.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 18284 bytes
SHA-256: df0db918f29c285cc572f15db7a83b1ee8f2162df70531f6d7c2b4fc386645c3
font_01_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10324 bytes
SHA-256: 1f05af1303a29eccc82f51f46a1f085d00bcf4fb07175e56f18c7142126030fb
font_02_sfnt_off00013aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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