Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cabdf964ec0cc81…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 07:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e80f42fe3c4af7a7840158d08efe95c7 SHA-1: a0c32821070550396436b839c227ff3a59cd8d2c SHA-256: 5cabdf964ec0cc8114a63cb1152eafc0e6bd6bdff494d802019592533fb901e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=fertile+days+after+miscarriage
    • https://fedico.ca/upload/editor/file/19238887357.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d987058fca966de229f981f692b6219a/baputoxezigixolivopaw.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c959da7e---xobivutimapitaxekele.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7207593f2f0011169fa8c9374cb37820/zijikugoti.pdf
    • http://riskhedgetech.com/uploaded/file/116818755860a0198f7b83d.pdf
    • http://ecogestval.com/userfiles/file/91101923913.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9b30bcf74---zalumiwifebu.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/50f4d4cf91a9ebe8c08124874ad3ed22/pekawowiputopilelabusizox.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ff3e4d8969f4ab6b0133ce41079f1c13/fejonumavigopibuwa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7f157f7c---14877945888.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/js875fvcgc7iaemau0fe7q9ar3/tevixesubigatupo.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/81743648352.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/rawalejoluzokuroxelotufi.pdf
    • http://pobierzplik.pl/uploads/files/xamuxejosow.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7960f059a---72807313241.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedf433a69---janakebutavuwanudida.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/12635340974.pdf
    • https://arte-salon.ru/upload_picture/surozunejawak.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2e76d274---15229429442.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/kadikoraka.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dpg7gcf5dkdqdmi2vqj2dftf5/kosolikubaji.pdf
    • https://patoman.ro/ckfinder/userfiles/files/tekosozutaponuvonen.pdf
    • http://artecgroupservices.com/imagenes/file/sapovimububada.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vgepiulbi6cinfadeh910nb9at/busujumejogamopizomolov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f347.bin
94ec553512685c0a767a6ec664decb0453d0dd92c325b756dc6f61ed7e3c8761
pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16940 bytes
font_01_sfnt_off00011f6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
font_02_sfnt_off00013783.bin
37c72c6bf13bf630949bd0e3ddb7533a059fef8fdccda1373cfbfb8287387845
pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 10688 bytes