Malicious PDF — malware analysis report

Static analysis result for SHA-256 db202165e7d4eb19…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 07:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f9075a6276f0415677e16cfb3962a7f SHA-1: c3f91e58ffcc721f1a5f44166b5397c34494ab87 SHA-256: db202165e7d4eb19299b835d0a5df119f556b41289a0aa382b68a791e6fa7fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://jordanadams.com/ckfinder/userfiles/files/dipoxeku.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/28061186626.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210903180334.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/wadaminoxaderuwoleb.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cadfe15282bcadc78f09485a0421ffb3/dukerovivexur.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/27488757473.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/425a4a3a7c73d2503e644ba60a2cf14e/besujasep.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/90456498558.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/buminewelelim.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/58250876598.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/serasevivuxojezoxegavo.pdfIn PDF document text
    • https://agrando.cz/files/file/zizijozigavud.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/67258977896.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/19886176131.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/84651249615.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140697c4c368---roxavasateruvagowamak.pdfIn PDF document text
    • https://jjpremiers.com/files/64286235283.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/11582472749.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ebd0e1096---mawopefopepuzapakaraju.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/32781976194.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/87186601082.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/18046706334.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c095ca5---zokevozaj.pdfIn PDF document text
    • https://ahha.az/userfiles/file/11864608848.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/94975754505.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/movagepoxadunopisinukuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=atomic+radius+meaningPDF 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_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10748 bytes
SHA-256: 4abbe31546051c069eb6655096ca3e9b8604ff9391f179ff826526c59a023fdc
font_02_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 16704 bytes
SHA-256: f9647ec82e7e67cc0bc88ad20f279532809a0357e4bf70469de9a3430917e984