Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd1eac89a26a53b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 10:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2316b4473d517fbe63293e55ec5f5016 SHA-1: 7a12cef885bd9c3e0aa56e3ecf01c6fb1770ba10 SHA-256: 5fd1eac89a26a53bdf802f8b49a61d2009b163abf4cd24b1ab70f061db166fba
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The primary function appears to be acting as a link farm to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=grey%27s+50+shades+full PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccba756f2---19053591986.pdfIn PDF document text
    • http://tochalco.com/uploads/files/norivunolujelonozosafopo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wonudafirutunokap.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130689d806f0---12793247492.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7b2c9403---sajuluparumat.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/vitulawamo.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/43248409653.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/90658644951.pdfIn PDF document text
    • https://tsegypt.com/file/95747587491.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wavisuruxozunufipuwi.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/41408232881.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/xosujomebugaxixisoro.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/mijaluzovusure.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/73527545019.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/bafera.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161398402683d6---xafolasobira.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vebanewowutonuz.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/muxezeziruzuzufo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/37186067035.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/diwokegibinugovanujiwefu.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/21840614748.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374cd369154---26635872292.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/sapitomafo.pdfIn PDF document text
    • http://irinabailey.com/upload/files/99480924467.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_off0000bf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 16428 bytes
SHA-256: b1abe85c19424a642ae3240210ab3666d87bfb3b53bd6e1e30bf68bef62bf856
font_01_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 10580 bytes
SHA-256: 6443e74b11701316b5fa3fb59a6cede42acb8a8eb6935835f5e55e913402d775

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