Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dce2b732d75ce6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 15:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fd1b5789856574a18c304525d26eaaf SHA-1: b7a0cb94cb8490bb045127b10d47de51e746eb38 SHA-256: 51dce2b732d75ce619c824d817c62981752701100ef6554007db36eefff13b40
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous links to compromised websites, many hosted on WordPress installations using the Formcraft or Super Forms plugins, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs point towards an attempt to leverage these compromised sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a64c9cc57---vegaropererebezu.pdf In PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/e21c20abf93cdc0f4a855be5388d1d53/biropasisasopotojid.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/72958107510.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ebni4rqa3d60fd2ipre82qaea0/xarubatinenuzukarisunox.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bafuvigaj.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160924304a975e---91126996874.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8d7c19e7939d4306ae32be592b896e09/9817234433.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/56494353429.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/47013e9188da8649bf025dbacfe353a9/51306886970.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fcab296c4f05476c5885cc91132dfe98/sevow.pdfIn PDF document text
    • http://naucseto.cz/storage/62949775788.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078922a62eae---29838309343.pdfIn PDF document text
    • https://atl-50.com/files/file/99656102656.pdfIn PDF document text
    • http://minerva-collection.net/files/files/62647885960.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f0988fe5c7b35cf5467b64da1a5c28b8/40447905055.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/zijuximamuropuk.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/jarepujo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160819ddf730c1---bigexexisa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eeb789e12bbc664f80ea87ffadda176/nesunosil.pdfIn PDF document text
    • http://www.celso.org/download/54290429108.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fbcd4a8483370e738665cba03a6a2418/xuwitadomekem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=electronegativity+in+organic+chemistryPDF 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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 17240 bytes
SHA-256: 4ebbc52f919673fddac37e08ea1081fa9026318fc4a26a162b620b3ce593cead
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10840 bytes
SHA-256: e29c2b5a82a5d2d8f6a07fa11b0d5c0e91e34622160ebd8bb14ffeacbdc96f9b
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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