Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb2944535e966d0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 09:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51aec8dbc9d5131f21d9c3e2c962ca54 SHA-1: 2b529a11271c4cc1205826c113f0318d09329047 SHA-256: 9bb2944535e966d0aff8b59bc67377457d39c3070d985a84882ba7bd1dd0ac37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=live+boxing+results PDF link annotation
    • http://ottomaniantextile.com/userfiles/file/51461874796.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uqjio8q6sukafs61fe22vausq4/dubasanunavumigu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1acd35425d55100ec324b887afdf5102/97277823460.pdfIn PDF document text
    • https://network-italia.it/file/rizunozawavexixepituxine.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pikunajijitasaba.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/14515110608.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wurozetub.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/12808807667.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gejifejazebeputugezizime.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/95461560699.pdfIn PDF document text
    • http://fullx.net/files/67517975165.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/33387940851.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/15077145933.pdfIn PDF document text
    • http://chinazzjx.com/d/files/82757915017.pdfIn PDF document text
    • http://midospa.com/upload/files/53893893493.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/91270020201.pdfIn PDF document text
    • http://gtshotel.it/images/file/tuxexowuge.pdfIn PDF document text
    • http://iltorg.ru/upload/file/dozigoredumuguzenuf.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314ae3f5de---52710322160.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/pukaf.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/tupogiwuxugifadudi.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/beter.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c88ab704d---13373951743.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/darivojaleluzivalomib.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b4dfd03d2b1f2d05eedfd759561ba5aa/korekexemigerutotixu.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_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 10488 bytes
SHA-256: bf21e94871e22db47566147c0749cecb1fa301ec0ba2ae9a0edb3c9ef4b3ec1c
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 17932 bytes
SHA-256: 07f9524ee013dc5dc860dcc8b5c99891f67187ab3180b56940c269e67a7b65ba
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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