Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce3ac289efdf197…

MALICIOUS

PDF

87.1 KB Created: 2021-08-10 22:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2484933f3d24a3d1af45a74b1b28bc59 SHA-1: bb7f3173af41eaa5d194b2162aa293be466c3f86 SHA-256: bce3ac289efdf1975d145181f2a913c62d6df7e3658de0ab7ecb48aed5d91664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hugslock.com/app/webroot/img/files/wadijulej.pdf In PDF document text
    • https://robert-zauer.cz/userfiles/file/88609404888.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/bepifujetiwawa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8a43ca8c3b1002bb96ef4d0fa71b335b/22626715751.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/bixubedegenozok.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0f1fd89047c29fa5ab798ee86e505b76/nelebuxamaxofofokema.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xakozitizokigas.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/fefaxaburibipu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kisatawodubojopubigusa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/01a3aac5b7538de46c9615e07f3732ad/wimoja.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c466351db7---wasogumerodiwipuvagor.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e293e18a38b---85211009922.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64b60cc4a---76208357378.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/84371707346.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa829a6d30---xetirididereloped.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/87065635059.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/523ecf3956a55c0c8819b4faa298f79c/52595790404.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/matijibasiluditawigodexip.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35b36783c---gubofa.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/52955461073.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/varepososizigefukima.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/177bc3d89c51e00676caa62e4c5144be/tutonigiwulubunedakam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ideal+gas+law+problems+worksheet+answer+keyPDF 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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 11132 bytes
SHA-256: 45b9e800ee61147cee85d7046d78913b7ece2244e144b23d3d584e09a184c8ec
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 17440 bytes
SHA-256: 74d6025cec1296b857bcc004edadfdbc898063e1d2235a4d1c4adf4e56fced0e

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