Malicious PDF — malware analysis report

Static analysis result for SHA-256 301f678f6b943f75…

MALICIOUS

PDF

98.3 KB Created: 2021-09-02 08:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ede42f538899900e47e9510e2a96ad83 SHA-1: af88000232cd2758dbb8421207cda48682fd970b SHA-256: 301f678f6b943f754c8eec4ae804cc486b4a8cf02b82bae03774e2cbabed4004
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or distribution point. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.pilartangguh.com/file/bupovo.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kipopadisujubabukokonaz.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/81326820019.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/gogutiwawenixulixuzaluk.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a697dad1c34---volibudulijovovajoj.pdfIn PDF document text
    • https://biodez.lt/i/File/15577423576.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5611c9eaf3d54e5abaeaa530a13332/42076354814.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/polujasobuzorolizose.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gujotuxutedes.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/51653115468.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/20689670928.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hflaaov74bmbpgim0lpd9jbch0/54474274179.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4kojhnn6vod4bqkl1ddbss7svn/26017349203.pdfIn PDF document text
    • http://flexicourse.cz/res/file/lurisuroxi.pdfIn PDF document text
    • http://getem.eu/files/file/57248517392.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/46617911289.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zixidezokezasixirazisip.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/wutenilizopelu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/11dju4bofv74lm29rc747pgfc4/xododafoledilut.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gobokuvesikejexuza.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/fubedifijur.pdfIn PDF document text
    • http://goref.ru/files/file/ronuripivusamuxutas.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/11838348936.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072862346bf7---pijokusadubibijixuzawek.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/6595274312.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobanori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=heroes+magic+war+promo+code+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 19112 bytes
SHA-256: 7547b53b9d8082e783c154828010947a17fd31ce69ad206c466169f664cbe518
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 17648 bytes
SHA-256: deefb2502cd2bc7ee57d433a65c5b3e8251993b3446cba4c89cf2407490c3675
font_02_sfnt_off000149fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16211 10792 bytes
SHA-256: 3beee9fa9b7071efee52b1eee40805dc8180442f9411e0358614d42d55de31a7