Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e620588f654d0f4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 08:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cc40df8ce949c3ef458420953cb9719 SHA-1: 1008f6a4341c400ce8e8340c898bf9dc29b3e7dc SHA-256: 4e620588f654d0f4e110d08b8ca90e73884e442de57389a753065c70345445a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://timebank.ru/sites/default/files/photos/pagefile/84866376497.pdf In PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/difuvofuziritamifunenoviv.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210615_9346FBEEBB3E0FE3.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/u7hsgnbsunfnjhqptl82s8dn75/57701432237.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/1696562426.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/79373772927.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88cce06922---joniwedenuka.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kimusawugasedofixojezu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/bobomogusewepega.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/03a97ceb21e530dbcc68759d5b39fc4a/30496941776.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42308016665.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7899cfd6b---79854172606.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/52288447720.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6afc9d68634986a8614c5a177f1d7bef/nutus.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/56ca2486290bc10f00dd62c6f2c803ef/lexizafi.pdfIn PDF document text
    • https://akemi.ro/hirek/file/vevezuta.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/33051851467.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ad84158---77001457497.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ba9ef8af---pizogasekixiwozopamobak.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a1c811d17997e2bd9bd99561ab3aeda4/73956542046.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/93514235763.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/47681333609.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/gakosepofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bamboo+shoots+nutritionPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1c450ed075c7d31d88ec8288ed78706b/zesifofezisokopo.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 10488 bytes
SHA-256: bcf4267bd2587cce910f8c132795adb9309de5c377169f047ca6aa2990b823e6
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 18656 bytes
SHA-256: 6ff65cc8641e01ad77d8514a5e6548fe09484ca49a373aaf8954558e60adc5b2
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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