Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859a57d973a5378…

MALICIOUS

PDF

81.0 KB Created: 2021-10-20 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e589cf1fab2b183b90271b178f424de SHA-1: 178aeebdcf8c1328eafd7041fbd49d178d42c246 SHA-256: 7859a57d973a5378722da67b00d978902f3d2c44c69f2d6f68005fc06063394e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The document body was unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to harmful sites.

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=card+sequence+in+rummy PDF link annotation
    • http://szmchem.com/userfiles/file/wuvokosifavatelowe.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/zagumosamom.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/dilojofilasiku.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1a6b0770e---86663709153.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/28935691052.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/86253155585.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6b078224cadef4e1766135dbcee2aed4/26391099867.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ad355d81fdfcacb6f5c139d18f808f9e/venafix.pdfIn PDF document text
    • https://umutfm.com/resimler/files/7370146179.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/28609832075.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/67083122148.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://hataylezzeti.com/resimler/files/livejozabugapiliwavagep.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/77914954897.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/xazakirazesiwaxa.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/lurib.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/womekugobapub.pdfIn PDF document text
    • http://prota.ru/upload/files/vivofakedilixasoli.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20211012236425244.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/futemetevilotedod.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/47282908613.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/sanovodawalexuwurov.pdfIn PDF document text
    • https://forumsevens.com/images/file/13911988542.pdfIn PDF document text
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/ginopawujuxarububeko.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0a98151d---9408148801.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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10656 bytes
SHA-256: 66cbd1675f8ec17b53e0f823acd430367a7c7eb689ec5724e161f8e9d3fedc90
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 17604 bytes
SHA-256: 8ea19efe6b75e559adfc5eae940d4c753cf76f0fe03905d87c681fe82fd86fdd
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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