Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7aff2584f0f4b9…

MALICIOUS

PDF

117.7 KB Created: 2021-09-04 00:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b754acc9c005c9c31b1b877ffb9a10d2 SHA-1: f3b737c68a858205201c6432aaa1c463a576b562 SHA-256: 0b7aff2584f0f4b9bb5685495487abba690735b4b23994b5fab34a922f25b0f1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, including those hosted on disposable domains and WordPress upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=mk+ultra+cia+pdf PDF link annotation
    • http://studiolegaletrotta.eu/userfiles/files/kaxobegezifakuvemuxemi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/tulozesagorato.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df108f45c---besetobaxarewedawanokoje.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/aa6826357dfc4bf7f7f8215240fdc61b/mivoveregobufezukisik.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/39691865724.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6ef22589---60384860561.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/pevegusunibuv.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ribopuki.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/86243637597.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kevenobeto.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6a06bbb5412be7d8a2b71cac678e07a5/96990831267.pdfIn PDF document text
    • https://mmszke.hu/files/file/fikuwepixaximepuso.pdfIn PDF document text
    • https://akvaguru.hu/user/file/vekejad.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/62779647854.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/90969995026.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8522578a---bogamoxufarisaw.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4991ebbb03---46844948685.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hf4vmaft1hace5quj4v1i6rob7/120699163.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/61565422878.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773b9ca2581---49539577318.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/10959965678.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mojewajiwazuzad.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_off00016263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16263 21460 bytes
SHA-256: 0304d55f94805de4e511570cf83f51176bd132d73780796fe77af369b7795fc3
font_01_sfnt_off00019965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17C 10276 bytes
SHA-256: ba75e5b305e22c34b22f0995c4c52984accb68d36ae5d15a0a45900041eacd69

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