Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6442141c2553904…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 06:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 810b97155856147d5f0d04501103e9aa SHA-1: 901c4103b6d429d3f7026dda0475a5eb01fb4c3f SHA-256: b6442141c2553904dc7f3cd122c9aa8ec6726acb4e35b860453229e59e46c9fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure of the PDF and the presence of embedded URIs suggest it is designed to lure users to external sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://sungder.com/upload/wekimemasetemepejeduj.pdf In PDF document text
    • http://bebaldebaran.eu/userfiles/files/1589059471.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/xagal.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/97365720977.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b65ad3751---majajuvujovelepifid.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zudejis.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130708a1bfb2---59942539713.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d44102f32---95545050998.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a890f595dc---nasosoninomodup.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vk4u17g0a2mi2pu84u99igl0q0/lovoloxafoxunelesatug.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/44174791299.pdfIn PDF document text
    • https://purefeeling8.com/data/file/15771354180.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/76928938843.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb68be163---wefojidur.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/3858290352.pdfIn PDF document text
    • http://turatabor.hu/media/59564580753.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036caa22ac---7184900138.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/nopego.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/53999414584.pdfIn PDF document text
    • https://bursac.net/userfiles/file/xevukotonakebonu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5db33abea---wemefajigedarori.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96222127726.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/mejusal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ru+uninstaller+pro+apkPDF link annotation
    • 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
font_00_sfnt_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 17024 bytes
SHA-256: 7a63b4c693ffbd76798163f6fe98394758d0194cc8ca2e9386cc00ea030022c2
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 10480 bytes
SHA-256: c4fb3944c70a932fed1e31d1821c5c58a1e6b5b909aae89fc2359606c5d25e48
font_02_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 25796 bytes
SHA-256: 519396ce5a883189a1af143ce3068259d83eb7d555b45be87b3c07e9ebda201f
font_03_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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