Malicious PDF — malware analysis report

Static analysis result for SHA-256 d884f6794d5ad400…

MALICIOUS

PDF

101.4 KB Created: 2021-08-23 12:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f3a8853f7187ca59da44924193823b1 SHA-1: 3773835ec510e4d23c1c166f641963fc7273c7a9 SHA-256: d884f6794d5ad400a88b0a5f2d3335854f58551aa77c59ab022b507dec4c2000
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple links on compromised WordPress sites and the use of UTM parameters in some URLs reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4e2dec3fae7037f4df813d85735bd13a/96084444686.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d103f38a---jemamaduvuf.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160800008f3b70---12460560717.pdfIn PDF document text
    • http://beateromer.com/bilder/file/gibelaxaginevelawu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc944c87b---14129489162.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/jereberikanibapim.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/83468329757.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xuvavimevugus.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntf1qo7l45ouh6k9q1mjpioqri/5315452255.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03b82ad03---gisosefexikenagefukadi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c687933a920---buxagozeb.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/536b8c67211fa9741480f9370073ed00/72230633725.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4fe6d094609cbe23d264e48167408bd3/18629545517.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5d8ad3aee2bdc6dd9081efc4e586801d/ladibojelanekan.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/pasok.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/zovilip.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/supexejekizajegoderep.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5531b93ada151057b3e3ee1442cc98d2/sagepofujono.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/44779279234.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/51346193877.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15d2a612e---luwuvane.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/bivaxabudogomikilimepa.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/vigunuzaxuramev.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228907c647---5520739135.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/74421740825.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee95c57d57---wulipopufemozobana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naked+male+actors+in+moviesPDF 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_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 17960 bytes
SHA-256: bede47b33eb88a8bca23dfdf1a50884e709ee36fd1bbadff6c449d3540212b36
font_01_sfnt_off000156d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D0 10664 bytes
SHA-256: 27b10e401053734b5db3d14d291590d96e6bc506f3533fd3ee76bb8094bb5953
font_02_sfnt_off00016f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.