Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91c1b8561c1295f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 01:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 505e8434bb8b416f3ed8e64646e69f92 SHA-1: 6cc6086d44c6a784082e7d883fc5331431121028 SHA-256: b91c1b8561c1295f523af5bacab0aff8716ec458aed069640259e029702493ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links hosted on compromised WordPress sites, suggesting a technique to host malicious content. The presence of multiple PDF-related heuristics and the ML detection strongly suggest this PDF is a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=3d+capture+app+android PDF link annotation
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/78074156578.pdfIn PDF document text
    • https://pindimana.in/uploads/file/rojopoforojifume.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/74215397675.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/68500466258.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/51029815312.pdfIn PDF document text
    • http://ucokampen.com/media/files/93019003903.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zezajedopirusav.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756874f908---78143015923.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360393097b1---zoxovibijadaxakixute.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109161635515565.pdfIn PDF document text
    • http://julianina.dk/upload/file/pokekolelunik.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6fa987ff---48223934256.pdfIn PDF document text
    • http://standardamulet.com/files/files/kowurufilumoximizojofix.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/gomuwogenakunojom.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/fokipa.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/32480265050.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/62769672041.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/budenedefesudabozorenu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tagoditomeloguzujawogujid.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c43bca34a4---lokezevuvoruka.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5957c41---luvaxagobujugigofi.pdfIn PDF document text
    • http://www.puhito.hu/uploads/1310497987.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_off0000b8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C5 16060 bytes
SHA-256: 0e4279c0529609e54c579bfb4887c2fe0c89056c9c92540830c2c5cef3c77f11
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10468 bytes
SHA-256: e3a21660025f94bdabf0ac0d11dd559b761983d03103e35a985d6669bfcf953c

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