Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbfd99301bc1aaf…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 15:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea4ed4427b410fc3c282db61ce467bde SHA-1: ccf35a75ffd64e59a2e4b1bb22ea79ea0907d1ad SHA-256: 2fbfd99301bc1aaf6d09a8fa61d6d37acb7f6129ac19270062af051f210926ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to phish or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studioaeditecne.it/userfiles/file/34292341094.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e2e9271b---bewiwozalu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/rizonisinutaxofunodar.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f08dd8124---99787445999.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/1484845041.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/54876328418.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/55612539200.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210918072841.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///44079357648.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/tojimanaredixogiperulabif.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/tibidivasetonax.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/63009421718.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/47255651603.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb85d30c6---16841705667.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/49948980619.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e75c77d5e3ce263db44d5afb78974668/10820900619.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/83943341699.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tulewifetezolozidujafe.pdfIn PDF document text
    • https://0900107678.com/upload/file/73900453004.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137b739a455c---levelinak.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161472b63d5646---wetusoxenagi.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/8465181415.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/ponun.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007ba2c53a---sevitukedefatovadipegapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stream+to+fire+tv+from+androidPDF 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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 17372 bytes
SHA-256: 9e47ec386f195ae0b97e7e0c2492640e842ad1c84ac0799d8b548ef8e2a95591
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 10444 bytes
SHA-256: 0c6e8d7e1a2319a0376abe67f9cf2973d4b1c9dc1bc4ba3ebd3c2d68553a8a8a
font_02_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1