Malicious PDF — malware analysis report

Static analysis result for SHA-256 9531a2359b7703c3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 17:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf6e2296a0afef520be1366e79d1ceb8 SHA-1: a7d1ce7ad39ad93bd698078fb4305b86eb06f6f0 SHA-256: 9531a2359b7703c382f8cf853afc2e73577855c95875face7fbefeb52e2c427a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4e82aecf5468a3f3cfc233ee8041b14d/tefajomox.pdf In PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/83671634e84faae0cec09e4d416f0a01/22397586191.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/ditikitezetifesadewed.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/95842233889.pdfIn PDF document text
    • http://fygl.net/uploads/file/162227407708.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/salujunutiruwuso.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9edccb6f0f5ec807bc23fb01ca8ee1b4/runijufofuf.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gozamojolarejimagu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/add4d0upfqo1k2kc25vc445pk8/3096494091.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210727_3EC2DD626B4306F4.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/383075baa53175bcf06db18535356b5c/xosatimekopamugafokugi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/kalapekakadu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c422453d747---35349966445.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855afe254aa---papigoke.pdfIn PDF document text
    • http://tavio.su/files/file/kaveliva.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/6871752225.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/tovukepiwokibivugep.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/62fc5a820cd883244a8436ffa42c432f/poruzavefanomalosi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f898112e64---memikopusefe.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/napikelibagezuloxapem.pdfIn PDF document text
    • https://ebooksweb.net/files/file/57346864494.pdfIn PDF document text
    • https://spacio.hk/attachment/file/rerer.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/76236255826.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f446386e056---roriwutal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=laws+of+motion+class+11+notes+pdf+physics+wallahPDF 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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 10996 bytes
SHA-256: cce0c8073242a4846ec862e2a1d71fe677798e43ac7587df46847e0329268819
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 20616 bytes
SHA-256: a5b0476b62ffb1a289456818b5adfb52f9677385e332601a28f2d90d0f23b77b
font_02_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1