Malicious PDF — malware analysis report

Static analysis result for SHA-256 376a01ade06cbe07…

MALICIOUS

PDF

81.5 KB Created: 2021-08-25 17:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3214711c6f1d776839229ff18c334fb SHA-1: 0fc849e98bfdc01c729d1091af90235ca7eabda4 SHA-256: 376a01ade06cbe0794566fc3a88220e378b7062e0d543ca994b5378a61696391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lederstuhlshop.de/ckfinder/userfiles/files/vededelijabowavaduziledat.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3302d7ec8---jamituvinegazokowagegi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160983e68ae2ad---taparuloselowadutowaj.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/23625369842.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ci7ak9465k59bci1irvlql7bi7/mawekopijemudaxatutase.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/tudorakepizozo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda44f2bc5---13959341809.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210817_715ADFB96D7110D7.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bc22ae82dac---75752387654.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/43681125923.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/211308151.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/jezedo.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/74473200938.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///bebixova.pdfIn PDF document text
    • https://cakkue.com/contents//files/12206554158.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cb1b5d38c901367c932113a04916e14a/joxulubifevixunu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/zisuwabef.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jigeludaj.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/64769676984.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e48c9ab3fb39de1d2329068570a21cef/92346000036.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/50a9245319bba7ae166794643d6334e5/ramatufakivil.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/dizerofebalixabifapujis.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/49697663990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+you+brew+whole+coffee+beansPDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16820 bytes
SHA-256: 3bbd87e923ddb67868c7281254d06dc5aff7853b0057909af0dc2d42c84ed20d
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10712 bytes
SHA-256: bad88f8a2ac37fe47f5b09242e16b20ee8db1c04ab1755f0e1edd694ed83fae8
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1