Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e72d9ac6c8f46b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 14:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9296bcdd7cf7ab634aed8e1f10896858 SHA-1: f72c0a263f6eb4cb55b22b8b05ca22215ecef46c SHA-256: 64e72d9ac6c8f46b8135a69271177e9baa0df1869a4b98552dda9ba60d69913a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://uleshuzataruhaz.hu/files/file/pesilopitu.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d31c7289094f5f9705b052399e72f140/28006339616.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0ca3295f---94565022537.pdfIn PDF document text
    • http://simonide.org/userfiles/file/1355738532.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/muwudoxisubefowekemisifap.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/13413283156.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jorofo.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/49308944113.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vugevonat.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c562853c78aa003b214459467b0fe4e2/42171432615.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/55999875913.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/91833586997.pdfIn PDF document text
    • https://elektrona.cz/files/file/86948875993.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16129e13f3bb4a---gekumapilal.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3f96d4bc---48417915711.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/zotezagoji.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/durijewegibuwotos.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c42955a7fcef140397939bddc6745036/lunegap.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84f7d2c83---bejedatafiladobimak.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/xunatisavegezopenopup.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/popolumi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lje192i7ehvqlstmcfsq1the15/983051088.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/13394630136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=types+of+chemical+reactions+lab+worksheet+answersPDF 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 11140 bytes
SHA-256: d36abc61755850d10db37d2675c6f8c3f2f1ec0cd0818bc4f829c592e71b10a2
font_02_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 17884 bytes
SHA-256: 414c88e9a0d95df69c981014adbf73ccceb18851c1adcd06df91ff4b2b969363

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