Malicious PDF — malware analysis report

Static analysis result for SHA-256 0546936e1dae2846…

MALICIOUS

PDF

84.0 KB Created: 2021-08-31 22:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41b8625df4f552a44756ca4dc65488d7 SHA-1: b383221aeee5211a45fd96339133291f43eca953 SHA-256: 0546936e1dae28461b21a10e2b5a8154540cb448781752024cf4b7823e14b463
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially compromised sites is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada903c1339---68799115785.pdf In PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/26138427037.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/2916160324.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/82814415648.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kjd761jjnc9nto0668amnqt6n4/zuvimubepujovegaketep.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a8125e163b2d15d87d3b2b4e4f3a79e6/gatolitum.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da159bcd1---ratifenukelu.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109010155153407.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/jozemipem.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/wupeni.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5092ea57dd87749fd2cfd63676896cfe/lofezigileluxenotiw.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6420dfdd5c42c9050da4d687f346b421/81929480735.pdfIn PDF document text
    • http://nessium.net/userfiles/file/50310017463.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/mefop.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/velujolebuba.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/rejukosijizit.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/100e6b6a28f7d6d934f2a25e52c60aaf/83294192741.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ei5ibehuc5n3eaqoreqkkahe4o/91807756485.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/14593110378.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fipanegebit.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/46985359454.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23dfbbf79---bezovigeneguza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=allegany+state+park+tent+campingPDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10784 bytes
SHA-256: f0db4322854283f4a52dced45ce6537c6afda58e06b29d6031a3ffe2249807b9
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17724 bytes
SHA-256: 1989acefd2fc69d42a0c752a4ca17ec39243e1a8407d3823d90d48f34e9f9706
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1