Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4cab525c7e32c9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 04:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f46d3c52a65b6c1d3a754a39b843c752 SHA-1: 18b47f44b0715e2571d01328ac2e989698598c63 SHA-256: 6c4cab525c7e32c95d82d63353eff8ee9eb0897ce0d5503b476810f910312432
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, directing users to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=get+followers+pro+apk', are likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=get+followers+pro+apk PDF link annotation
    • http://iehyun.com/editorupload/file/vulubirazusufowit.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/gukoruxuxerakawolazado.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vinorebefep.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/miwobemuri.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/sesuti.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/loriguketud.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/numag.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59771859605.pdfIn PDF document text
    • http://chamdure.com/DATA/files/92610656489.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/tatodijirexotetame.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/55432312492.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aafbf392e---86074553702.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/803376260.pdfIn PDF document text
    • https://etadelloro.it/images/file/129775041.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lalukejivunanatutenaxeg.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/figowebisinopeminax.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/829fadcb9419db2961a7595479d94cab/85966947081.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f0c65e77730815e26c89831d15cf40d7/pujomositowozepovij.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/60580670472.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435804edb8c---mamupokemiwipit.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/37615363535.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jozudarufufodali.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/29838081687.pdfIn PDF document text
    • http://forum-auto.ru/data/files/zewiwiditexozona.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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 19452 bytes
SHA-256: 9868db6dbfc67beccf2e7b3ea7164bf0e8dccc1e99804baef27d0ed9f82fe693
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 10372 bytes
SHA-256: cdf5ceb291db8a2ba0a696c0d7ae827ea5a310b083eb1c3a447757d973868de6

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