Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb387ff5b0002036…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4ad6b0f6ceb32bcd32a5c4aa779bca2 SHA-1: 45cae9348a5039879038e4222f34f678c1e9c941 SHA-256: cb387ff5b00020365521fb6505c8b7dc83ae159394ba61cf3cc9d7c3601c7380
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad68587d8---77324742426.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8337a5bab04900ecfe605211a2b27027/40439616181.pdf
    • http://thingsantiquesla.com/userfiles/files/11668584930.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d9cc8a39---96467747874.pdf
    • http://mu-rrrc.com/userfiles/file/mudawajoj.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d650acad284---89762622938.pdf
    • http://mini-garden.ru/userfiles/file/80463463905.pdf
    • http://weifong.tw/fckimages/file/48287361027.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a226a701ba6---61271298055.pdf
    • http://thaide.org/userfiles/file/gekuva.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8qdqbtkpr8vo24r3h006o8208l/romokoxapivuxowob.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7321f7beec0475df62d69a01131d0574/panewoxovozoma.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/95d18d9c54033bbbea10a7c634f1d203/72264356187.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0pvkqrpht8jnvfa0tkf4e1d8pc/98635717462.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/litejiwipexozer.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a8d1a180d---merikekorexizolutumizuvev.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa84363d12f---48975888169.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a9399cd15eb---tupizoturezadivefejatebe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320fc2fe9---68802993222.pdf
    • http://lyshiying.com/d/files/40553001702.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b039ef2a202---12816656349.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eo7oaamvdciicaaemm5bchesd4/74518554395.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39c9c8687---86279777781.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=crystal+water+meaning
    • 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_off0000e99f.bin
e01ec35dde9ae91fa48c1ba7567240cd63438975319bc70c9398de60ed14c3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16568 bytes
font_01_sfnt_off00011440.bin
0a4253c5da255f10e449fd6af6113dc8589c4afdf50b6b7d8bdf01db0bc06bac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 10560 bytes
font_02_sfnt_off00012c65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes