Malicious PDF — malware analysis report

Static analysis result for SHA-256 018f93e7b41efa45…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 06:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50e8e19b781341f188cea46c6b0c57da SHA-1: 4956f3f210a7be167596ababaea408acd2a5116b SHA-256: 018f93e7b41efa45eaf71c5c2d01d49e0b7912a123cbe01506d1c9919053bc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to manipulate search engine results or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://movementlab.dk/userfiles/file/jadisiloduke.pdf In PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ae088a3ec62daebbed29103ac6d38108/28980449363.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ad731eccda3d8392aea0ce5e3013f92e/99639738328.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/76279336073.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0r1dmmgsiqg38pfmn62663m8nk/nupopaseziponubavinifusew.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/98304918050.pdfIn PDF document text
    • http://goldmustang.ru/files/files/86649850475.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/76b4b90bd6eea89d489a1ddfdc56ef21/manegofakefekom.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/ravidep.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c898043db49---tabakudetomosofikezij.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/16691700504.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kusaburatofusoxatipuz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01494a7b0---48806587731.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/lelama.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/86614156421.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/21292600331.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/sumebafutivulisamagatej.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/29615459470.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/51993339406.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/73654293217.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/mubokomexiwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+christmas+carol+coloring+pagesPDF 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10800 bytes
SHA-256: a39e832532464cbd89b091790ba60aa5cd6841e4090207ced03f957691d1456f
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 17932 bytes
SHA-256: 4fca456956d5901117e2234e54f4a3eabab57d18a3ffba1cf96af0d341c58ff8
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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