Malicious PDF — malware analysis report

Static analysis result for SHA-256 448deb555e761274…

MALICIOUS

PDF

107.5 KB Created: 2021-07-15 19:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6b6a68ed39abd009a39b9de6508cb8c SHA-1: 0b6f89c498e40b3dc611412eb0dda4d1369b9487 SHA-256: 448deb555e76127404b45e4b79c28c316706efbf54752c2a191be2346949faee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://irlanc.ru/uplcv?utm_term=arabic+root+words+dictionary+pdf PDF link annotation
    • https://bangprice.combangprice.com/beta/cms_image/file/88867258695.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c97e398b---62330207950.pdfIn PDF document text
    • http://dentherapia.hu/files/file/69750664045.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/24781943789.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c3611eac---70908536480.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824f050c3e6---bigimum.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160909b2148bd9---59919638069.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/60985286638.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033d69b510---pejorimajotimap.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/41267bilv93h4t99cq8aqckc3d/53129075121.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e54c143---talugugebif.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/nabovike.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72349463388.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/79483872028.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/78705620860.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720498ccff8---nidukurufipuk.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2501845db3---63109138642.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7b582cba364a3de10791acd803e6d271/37649113258.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/76719071945.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080d87b30b24---18409026324.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t8j8v72hopakukbemdeeurcbo5/rikavaxubobexewixij.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/21b4ec0aa0f587cf01b11483b3c556f6/85885150530.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/28544115927.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/52883024076.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zobatetuberakujapuvi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210601_780D5F1FD5EC3586.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000158c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x158C5 25188 bytes
SHA-256: 47b99fb6b78c8cced34ce04ec89dddd06e19fb06625553c41589548ae6e3de1d
font_00_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 23324 bytes
SHA-256: ecc1710d66bc1dd46bd8924caaa59742edb30366dee756037230e5713e47696d
font_01_sfnt_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18718 10756 bytes
SHA-256: c6362430e1204363b9e322a61c3966b71b28fb9142262f7304a7d4f76cc794e9

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