Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6bf2240bf641fd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 13:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65fd0dc06c9243b41e478a19a946f2c2 SHA-1: 77451f36c69b6415ede816153bbce221c377d8c3 SHA-256: 8f6bf2240bf641fd81b127609dfc1a9e5554cbb786aee4b9159af899108161c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators points to an attempt to redirect users to malicious content.

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 https://archism.ru/uplcv?utm_term=mykkie+injector+app PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1gfkcdn89s6e92c2c4adk3ukrp/monojibomip.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/8670987425.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613009fd8ff80---nisav.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/34681158487.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/sajamebojulomovum.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/76069697724.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gamubuvivobakebiw.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/86724959224.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/74809778470.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/wafojateze.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/67014610033.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52106473364.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/visikozoxirilipaxobod.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040902277714.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/15184041336.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/61219202282.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e734efe49---14838817369.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/borutozuligewamaderoxiw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1b6eaa3353fc4c65aabc870f4e1e9843/dupibodevugivuxinimesafe.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630478868.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138407c89315---dejenodetupenilusubasesag.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zudajasetusakorufaxi.pdfIn PDF document text
    • 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16248 bytes
SHA-256: 97d52683389094b422d39034bbbbecb06ef1a60ca7f981f8f740a27c18e91ad1
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 10480 bytes
SHA-256: b5d329b526457b9b385e873eb1d601db6c46b60db26b3cb495089d300a046788