Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7a0bf4a68a804e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 15:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc590125dbcb805e74c844a54bf03325 SHA-1: 627353ae0c133e593ea59714dcc3b887bd0e82c6 SHA-256: 3e7a0bf4a68a804e48c58691e920acefdbf548a0984f0c2c9d21fea90cd674bd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised CMS upload storage, with numerous links pointing to disposable or unknown domains. The document body was unreadable, but the presence of many external URIs suggests a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0144b639---64162709143.pdf In PDF document text
    • http://cornucopiafrederick.com/uploads/files/wokafewoxoziwuwuxuj.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/lebigexaro.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vozagolasasoki.pdfIn PDF document text
    • http://favourtec.com/attachment/file/josozeviwin.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050214015673499.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/79131983058.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608569f0d5de2---togosedokafumesugufeb.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/43527278716.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/jipitur.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357ccf2febc---vezesosuke.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zopojepukuso.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/loxaxamufutorekev.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/romababoduvej.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/66340273531.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/71866c4504cba30f949e51a78f8f633f/gizujelireguvubisimitu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16118a0c4847d3---37271417746.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/49321222381.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/dasopipisubuxogofagak.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vktoi0fkgo39r6bfndt5lcv2b8/robofe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7912096f---nolanezej.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8a182bf64cec13d85d966c7124267129/fotelisutajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=membuat+cv+yang+menarik+pdfPDF 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_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 11136 bytes
SHA-256: 571ec9992bf6f5669620149a79308fb796d7cb1fd4c731140ba3a7bd706f5294
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 17752 bytes
SHA-256: 1e8e1e4ff824848821e1d3609c0acdcae4996c9b88b3efc135c424d37202a646

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