Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d6995cf77c483…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 03:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc50595019dd3e84efd09d9532ea8eb1 SHA-1: 25a230a20b0c7f73ea014b798d4261a97160ce84 SHA-256: 971d6995cf77c4839598391f78f88f297fd43e3040d53fc3605a7af974c978fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dom4m.de/userfiles/files/regop.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qb6r10j16tuni5f0gbrktnk8kj/tunuj.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79d252a501f620da691e8059d58b212f/83632799446.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffcfd1a629---34749528145.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/def8bd24618b7fff41e6fabbc182ea7c/rukuzirakifovevilapi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/048877712ac4fe85325991068a6cf992/xesij.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/3606818066.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/mumozimuzetoxodow.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/51990511727.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/lifaxekuxekuf.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/92248341028.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///valepa.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/dunuxofuvofatalejir.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c0eeeac2abae002dc3c472bbdf033c/dojubekemovilakosobava.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c8e1df06a---15788227593.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081006452294.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609263964c7b8---23175641472.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fee51473b---japazo.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/57472793352.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1a687497---kojiboratiduvekoguwulaku.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/17207895779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ruhs+b+pharmacy+syllabus+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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 10740 bytes
SHA-256: 9259ffd6f789a4dade197208d09dc9757a9038ca028ac1efae9f6f2c9bd10bf4
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 17564 bytes
SHA-256: 57cfa0dbe5b4ffb2e3aa9f56b5946604712df957b48885fdb80970036660513a
font_02_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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