Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca9f0b0528a6680…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 04:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e971ed26784db3626c8692a815921841 SHA-1: 93eb44c87ca9585e497dafa5535db8df6c4790e7 SHA-256: 2ca9f0b0528a6680800dedca81cf06e1c8c9ccbce1ab5493c6a61ad8d0f486c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chaitraglaze.com/uploads/fusaponuxow.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a5f54d9b---74855372273.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/48969912728.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/9747862929.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f827e5135---kivukodowefadar.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/kexifu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ndmcs7cimkm5bas0qtbgcc6sm4/losesusokoro.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ba7221fe---11348614188.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/71727385709.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e1e00ff35lcbf1kkn1q44g649s/zudoxeraxuwa.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/r2gft3o9iig0koiiel84a6tst2/nokewus.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/56220116982.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kenowijojetozazamibelepus.pdfIn PDF document text
    • http://chapelguild.com/images/usr/nolomadutodoxi.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/71084131483.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/43791770718.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/38d111e31ea7425d910efa3f506b0c38/75108079817.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0754457158---23829536599.pdfIn PDF document text
    • http://centronegozi.com/public/55019145742.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c6tihat37pltiu5o673qq0pr58/43271864779.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8be523a7092a8a172a2f2ba8f2cce949/44811893768.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/95885133400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=internet+of+things+textbook+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10856 bytes
SHA-256: 7baf07e068c290cc07590802024998783c8ee534dbace77f98515df040ab3fa3
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16880 bytes
SHA-256: 2c147245ec40133658349d63126d95ca3934ad21449fcf9a17dd4f14883de011
font_02_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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