Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1010f2e9187809c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60d3abb57e9b8c2164e0d5d4a9bfe3b2 SHA-1: a06a6fb575402f2f24c35340ab0c4ae0476c829f SHA-256: b1010f2e9187809c0f8527653b3fde997a477d445635afe775357e717f344a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/23eec2a8c81af7d8be3fb4776a9868e9/nireparukoviva.pdf In PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/givenepugolutarojizanop.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/warolesuvaru.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/33833660892.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8907505b804165f00ab9d221ae612af5/moripogaxozudi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ad68bbf79ed0e67694c56b6d35f84c64/pokanuluzudezuf.pdfIn PDF document text
    • https://people11people.gr/uploads/File/satexomijisutuf.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/1739837460.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/bodakalawonejesoruzabojex.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8511b93fbb84b2f0d37bf1c67bb6402d/80367533161.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/diwototajikodudinewogegig.pdfIn PDF document text
    • http://alltechsro.cz/files/kopolusoduxumexo.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/75613426013.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/8711026733.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/29413179405.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mibopepikotis.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/luvemowat.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/97313947515.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b576b5d3f4---3405253364.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/22362162302.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/75510026961.pdfIn PDF document text
    • https://digireg.se/upload/zepazef.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74db40a3d9---34435161058.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/91914897844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+weight+does+a+chicken+lose+when+slaughteredPDF 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_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 17780 bytes
SHA-256: 26a2739fa033562fe54e1e94bbe603d7213249c90e5dfadb7656cc0716322a08
font_01_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 11088 bytes
SHA-256: 6aaa34ecf2d89ee32729c0f397b9ef4bfb8d1d10a07c589123ead422a42da61f
font_02_sfnt_off000144fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1