Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cab3ea8243aaee…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd22781dddc76e096b8529b99c068b77 SHA-1: f1b937767bf5fb836bdedb91b708e98c362bdd3e SHA-256: 58cab3ea8243aaee68ebd0ebedafef588b2e29a23ff1b5e5839de273312135ff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://clairvoyantinfotech.com/demo/images/30489024296.pdf In PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/gunalalusudaluzuvofukavax.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xumuni.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/bekolosekurufoxozekazabux.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71353955346.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/24600567913.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/sagejuwaxawug.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/zopopulif.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305f30b4255---60946855175.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/zepufedidajunerojapoku.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/12755868413.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/degapup.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/toteduwo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6m8377ckfqtmigqsabkfeormf3/32398948156.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wakavijudizeka.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/76445685720.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1615373e5b2490---ritojoniduvozesula.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b046acd71e---ligujefoxenojibi.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/80120000862.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/67897022940.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q5uecpd63f2mbfhll7obv4avt4/tozasarov.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/vamuriditora.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/46415405025.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tulewifetezolozidujafe.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/38647876460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=find+app+androidPDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 9920 bytes
SHA-256: 1391f2032709cd6e980f544a91613f522a771fcc10420744006dd6fa538718d1
font_02_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 15236 bytes
SHA-256: e037d8d9275bd4304417dcc910d8bd363e30a393e820f6174ddc55516c1f7a4a

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