Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3fcdce203095d7…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 07:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7219d7b8205adb0ba716b074a98a5231 SHA-1: 0f498e885abf7679cc4948c352b7d6277b0d80a8 SHA-256: 6b3fcdce203095d7cd3ff284f1e65117d5e9f1b0d4fcb149cdd07b81799176da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of many external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=apps+for+editing+body PDF link annotation
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/89912614660.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/41301375182.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1v914b7959por61arc8q4quclq/31548680192.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d01702a4d7---82141570639.pdfIn PDF document text
    • https://anakmeong.com/contents//files/bonusizosuji.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22e27eacb---12399443144.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e57b5173d---73663289468.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/56096817564.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/24fd1d68141c4f8a45d0074a267e4c55/jozogujenisog.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/99a41f9c072cb0be006d66eafcad1715/zafojaj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffd337822---kegisifulemimenomiju.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3c6ab7c5d0daf4fe1f885d4d5147fa56/59966810308.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rejuzoge.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gekedazirelalukeve.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/4788099673.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8733f38bdd---lokug.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/milukopuvopudo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/gbgn8p38ij0jokc219lei0ahg3/20938263602.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dd37365d---88511040742.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wixuk.pdfIn PDF document text
    • https://btegypt.com/file/vobegofino.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4b8075d9fe6df7b688dc6b9db2d2960f/zonovazidadut.pdfIn PDF document text
    • 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16900 bytes
SHA-256: f573bb964b6392624a4a983109601a4f19ae982a592b128dc708b5f511a91e0a
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 10700 bytes
SHA-256: 5caff79f5296225c7f24a1dff08470846f145bb69a016db3f17601fd5eb847c2

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