Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ffbb380b0ede7c…

MALICIOUS

PDF

86.6 KB Created: 2021-08-22 00:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcad436b9d92f660a2c091bf1cd1e3f2 SHA-1: bdc6bba4459c91188884341ef971a100885c0eea SHA-256: f7ffbb380b0ede7ce79f3a7895e9a7e120a71b4e7b551c9e49a1c1b9f396ecb3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://khabul.mn/mmpa/userfiles/files/76172954357.pdf In PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vopogajaxopat.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8fbb35f99---sifete.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99769e7223---panefofonogidat.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/tutedejuxowajawi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609654777616f---78735100113.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c19b33dc1---gedikepenenatazejedoz.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/94765071279.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/mojijudiz.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/14179676232.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/zisiwosolejitiladudirogo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0dd3fe8c---munuso.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gixivivumo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dce896082d3---lomalawebadofotusixaxowa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/63351992035.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2nk39q8spkdu3iutbla0uq6rj4/37887391636.pdfIn PDF document text
    • http://proxima-design.cz/files/file/matefudefasinanoxunolib.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/fisorovodegazekuzegiv.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jv4vo0ajhm1ro26mjvrp31u18k/21056880682.pdfIn PDF document text
    • http://caramelitos.sk/files/penumerapesololamas.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sibodosefoboxenotenipimim.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab713d0e9c2---tavofudabufavijewufiz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4680c1253---87669630272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+cheat+in+minecraft+bedwarsPDF 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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 10912 bytes
SHA-256: a01b2e3abc96ec1360774c513fd4b84f787ecd60c50ccc0695fcdd584bcd5fb5
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16756 bytes
SHA-256: 28470d2a897e3a4cbc9315f719bfabcc351bfead9e7ee5fbbe75b25dad3edee3

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