Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b11894f73aee0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 17:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9951785fb4259613b621374faf8d204c SHA-1: 85450e173d2627b319317d4865c0d02f22c481b4 SHA-256: 8f7b11894f73aee05fe51c00ce2c73d1cb739c1cdaf05c673927cc7998c53f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://krisoc.ru/uplcv?utm_term=code+fishing+simulator PDF link annotation
    • http://spbi.cz/res/file/dekipekid.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pifof.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/76610020996.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/37887565652.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/27825502476.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/gesiwidovuvovusi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/34800011327.pdfIn PDF document text
    • http://gdgom.com/upload/file/210905202223663140j1710e6ggm7j.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/94213879625.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • http://orthodoxnews.us/file/ralilavalagufipas.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bozubo.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/wizizixaridapibokamuloto.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/tusugexowat.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/wubimegeforemoronebenuf.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/tidokalijawalekabefesu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3a0da00eaa85943fdfd1375a4bc6541d/paduzamavadojus.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/lopugaxavogeginagisafexog.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/bamalojofevupobipe.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/5483907319.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/43297495334.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/19ef8648df3da9b03f3d006b8f0131c8/pifubanomuvutaro.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463a5db7da8---98712725362.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1df90c6754110eba17c332a51ae6f1c1/88887084801.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/86326295189.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 10932 bytes
SHA-256: be57107aead0d5b0e760498ecad369631c6abd9efb0e0f13a6d9be08649791f0
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17688 bytes
SHA-256: 7934b485efcf13527d0168ab1ae3792971983e33b1c74078efee21d7c947c319
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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