Malicious PDF — malware analysis report

Static analysis result for SHA-256 20957a0a8591beb0…

MALICIOUS

PDF

85.0 KB Created: 2021-07-28 08:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eda9beca2cfe85aeb8639e207415604c SHA-1: 7cfafdc029710e84f34607b66768f6411e729552 SHA-256: 20957a0a8591beb0386cb724a987b6992ce6a23a960da93ea95f0bc52f0f5cc5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/58ctca4ee1j1cuc34ajpsc9j2n/dapim.pdf In PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/zupos.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/48061652707.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gexoferofeli.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/10122034434.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/zopazi.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/bateneselug.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/83777185991.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/91353ddbfcfbfd1de57296315c8f6893/88049983769.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/49357692681.pdfIn PDF document text
    • https://ultralloy.net/upload/files/papidamudidim.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tazuvuwipemebet.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a9d69aed---nudixafofur.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b50caaa2---27137792897.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cefdceefc---47960430351.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f5bb3268---69261076110.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/70925589359.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7b254b71b---94873999372.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/50176340722.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0209e99c---67040045833.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/57ac312e537fee5960602f4edf3a8693/66970514302.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/42672229480.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ba021b7---mijuzolisuzemume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hotel+white+palace+rahim+yar+khanPDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 17468 bytes
SHA-256: 9210810f7c5d0fbc0243c4a0ea557916a7704b1646d61887949327bcf8dc47d8
font_01_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 10756 bytes
SHA-256: 66ffa181f2f446b191b5e7216aa2b2be9049a2aca5037dc73d60239ee062ece7
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1