Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13248ac20253cbf…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 00:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba534516609ba4fe2964e3907ded7c09 SHA-1: 1c21f020fe86268cb4f8461d0bbea631237f14c0 SHA-256: d13248ac20253cbfbfbcb860531a8d74cc9529d6afb30271ba1e58fcfd02cd89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to improve search engine rankings for malicious sites or to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=dorsal+recumbent+position+used+for
    • http://www.radanhorse.com/resource/files/71526930586.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4650438a4126df47c66e8e20d56871a4/61890587873.pdf
    • http://viprealestatebrokers.com/userfiles/files/62841105808.pdf
    • http://usarsenal.it/userfiles/files/80788351804.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/71095982615.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b75db9e97---sigabek.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/411d773263fb1d0553c5c74640b29544/loruwimikadusajobobex.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091042f19860---sazukuzimotunawu.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7074f079---36865681624.pdf
    • http://www.cafeinca.com/img/public/contenido/file/wamemigofifulu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcb1e178a9---vijofow.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fbed5864dd692030a30ff60534134f30/14952369651.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nrtjjrkmhj5uj0nj1udul8fvk2/nowibojomevux.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ujv5ujcruu402sr445hva2dnpm/pategobe.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bc22bf175a232f81a39f6efbfae3be7/14993571645.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fa919c76---fugoronenuxasu.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/rajejanaz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d96a90c13---gidafonoleg.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d3c52c387---18888204935.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d37460e8f---buselomaretuposako.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nbm5jho1jesi8s466b00ve3p20/77610713833.pdf
    • https://nestuby.com/userfiles/file/58602415144.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ec332f28c8c47bf8d89cb2f24ed32e1e/19724255097.pdf
    • https://maconlux.lu/userfiles/files/43383952841.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076115422efb---67420405584.pdf
    • 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_off0000f3e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 16792 bytes
font_01_sfnt_off00010c00.bin
8311c4247909982fdcc5b4919c42d359a084b157abb5c59eaa48c5fd8b35af90
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 11020 bytes
font_02_sfnt_off00012560.bin
7c060ae4fa1e168f5484ae873033dc695095ba4effcf48f104597487e5e4c5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 19072 bytes