Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2999ee5ddc5262…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 09:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 244587be99b9698425cdaee8dcb365fd SHA-1: f7db2a34fb0d3fce89ff66a23bf825a15e6e69b9 SHA-256: 6b2999ee5ddc52621922b189b8020bff0945dbbdef4544d0367f8b4eaa3c62fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves tricking users into downloading or visiting malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bike-aholic.com/UserFiles/file/zoduvominunabutiruxudel.pdf In PDF document text
    • https://cowik.pl/upload/93351900518.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hpf49dvkhns60eddjf2gfrca07/40420337945.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/88042490646.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/wabejawaserijonafade.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804638104---41697875235.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fe8093220264deff89a08d3264acf42a/wewigesuxixubi.pdfIn PDF document text
    • http://oilspecchem.com/files/91290699263.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-14/20210714074143224308.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e66da77cac---vemodav.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/nopagenomig.pdfIn PDF document text
    • https://lemanssrl.it/file/nipebexebivevegumeju.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607df46f464cd---30376817981.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/5861056643.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/27032089785.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/49491318316.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/29621081200.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f85605c2---54017566069.pdfIn PDF document text
    • http://gtshotel.it/images/file/dokedekirofodiwexazur.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/11423623987.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vem3ldk7vm71sdledkib6j5ecn/ladoxesikede.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32e14dcef3588cf44d2649add4f8bfcc/wubefosonijuxiviwimo.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/voxoxovowitowipukarav.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5590682f3---25162388823.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7e4432a6f8331d6ed9d698a51cfb4369/turutaxuzitijororaji.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/doxikogolubipimefanejalup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=laurastar+go+instruction+manualPDF link annotation
    • 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 17768 bytes
SHA-256: 5815b48ee8e5dcda58acdae449f5938ca5ae344815d6a6c22d5cc3ed508dc4ab
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10496 bytes
SHA-256: ba8ac44297eee5ff0caba5558a054531dd28103dd69fbdf2372693b314dc6247
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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