Malicious PDF — malware analysis report

Static analysis result for SHA-256 5288204b024b2f4a…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 20:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a4e534f83ea2a50b8dc30de506bf4f6 SHA-1: 5e776c65097837726968a53435da8721cd453776 SHA-256: 5288204b024b2f4a1192a1a9d982553ee81a22bedbeaaefd8fd6b676c10dbac7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://garglob.ru/uplcv?utm_term=how+to+write+a+letter+to+the+parole+board+for+a+family+member
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb777fad---kufijej.pdf
    • http://orderkiwicafe.com/uploads/files/34470174087.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/44174163614.pdf
    • http://md-servicios.com/userfiles/file/76647416574.pdf
    • http://afgventuregroup.com/cfiles/file/limagogatosiwopuperega.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/bumalesovegixarosozuvuj.pdf
    • https://windsbs.biz/files/file/tovarugipogewudifawe.pdf
    • https://accuratesearch.com/userfiles/file/zukejizakuk.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1efa361d1015f1f36a93467966f6cf29/65060849521.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/25699d3932b8f81f87e136d515cc2be8/dodadumiwatomazobaw.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3d4a7bd2---99247647240.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa6e8b8e5---54273807586.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ui61f56ecqb05b7hfln2ggqmc8/27199587870.pdf
    • http://celcg.pl/uploaded/file/63887263665.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0e40b9bf---65923833833.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7989c0e77e44fbf0d6dc5ea32fed1cad/gozuwegirim.pdf
    • https://x-software.cz/data/file/29933918790.pdf
    • http://czdashan.cn/uploadfile/file/2021053007115973499.pdf
    • http://vencedor.coop/images/admin/file/pafudub.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/553d8b831f5ff2945a33a61bc5cd7d04/11887261312.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a989f0176f1---gepuxusafewajos.pdf
    • http://stmarys-perthamboy.com/upload/File/bafepuwataziwemo.pdf
    • https://korovin.org/site/img_ufiles/wagidepowida.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609086e5ac216---74151647436.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b90e9f27---jitofadinobet.pdf
    • http://bumsnab.ru/uploads/files/45959911197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90d.bin
3a66a76e737b1b79bb44fd86b554acd502ced97b02f7ac21acdd37a6031b9211
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 10824 bytes
font_01_sfnt_off000101c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
font_02_sfnt_off000119d7.bin
84b28990c926d24989bcee194cc5f8cac84ff7ccdc560d7c28b984b3f92772b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16556 bytes