Malicious PDF — malware analysis report

Static analysis result for SHA-256 db094f486d39b08a…

MALICIOUS

PDF

110.6 KB Created: 2021-07-18 19:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2610c488f18ba4e6c3947c39bef32b70 SHA-1: 75b8b521f8c032e377909c6ce1c41e6a593e16e5 SHA-256: db094f486d39b08ab555543de7e57e4c1e57717e239e1beb74f5b81c3f518c8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of multiple external URIs and a link farm structure strongly supports its use as a lure to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://goldmustang.com/files/files/29897588036.pdf In PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/kepowuwasijoz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fb0i0tvgcsdfa0f52ghufjsqkr/33075600213.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0477f4ccc9---vinetanogeluxixikibef.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744c9b940be---90870351349.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/e3457cd689a0c260587e2fe97d41d458/jizajoj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608832e9f24c8---109324942.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c297f83f24689d8211ad46b67c4135d3/rudupele.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-10/20210710131400456130.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69049b2aa9247fbb1a792851770b3335/vowesafarugumapikela.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/kegife.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/fulukerusel.pdfIn PDF document text
    • https://cooperspick.com/files/28841191848.pdfIn PDF document text
    • http://atya.eu/files/file/11988252632.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596d06d444---98482667142.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s0rqfd2onsca4v9kcbk5trjf26/rujakosunobabike.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c0e44fbe---jijekufewoba.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/31495616871.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi503tc4l58rq6i9d0i42q9o15/ginaponatupewilome.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad7bacaf9---77766708867.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zarafekotafike.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=why+is+meiosis+important+in+heredityPDF 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_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 10720 bytes
SHA-256: 7ba4895ccc49f9e27b55cc77066c6d0b02823d67ad77f4fb5fd478750020f370
font_01_sfnt_off000165d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D5 17472 bytes
SHA-256: b84c71ade9dbab7066184f4385b293cccdcb826b91327f8c1adc16d20035e6dc
font_02_sfnt_off0001936d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1936D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1