Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee6ba1facc18475…

MALICIOUS

PDF

71.1 KB Created: 2021-09-10 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85f85b1e66db81d7fa217b95fb83a010 SHA-1: a3c39b08161558c66ef0b7682741871173a3a63d SHA-256: 3ee6ba1facc184756d4b36b2a7be8092217e2ac83fd0464a1da905c64548040e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment, as they likely serve as lures for users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdf In PDF document text
    • http://altinay-law.com/images/file/59643691672.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/46627608944.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gororuxagijaxosipakux.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/67128030834.pdfIn PDF document text
    • https://viettrungson.com/media/Files/62454361893.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ijfl40lol5kqclshlu07mbhujq/zasexetaluwekurumed.pdfIn PDF document text
    • http://www.centralperdana.com/file/88581692159.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/43712891227.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/517fal7pk38hse38jmltejj6pq/67815703701.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e9eba8a---wezanufigum.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e1a47672a188ec6a090fd2a1629e1d29/kotaresebinapigelalabofu.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/fovofivanibijozak.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/numoruw.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_064958.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/kabarebiz.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6057558913.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/fakozotale.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/50859552223.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e9c3177c---40969529771.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/9m1d3lju5d71q6jgik58b6pfht/netimobapufanagawo.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/75370768551.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/tatimafaripe.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/93312296435.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/jugawofabilemotizefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pubg+download+apk+dataPDF 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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 10492 bytes
SHA-256: 32538a67ec61667d2633732c6848a5324efbb039e2c387a82bd5964440962ef0
font_01_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 16108 bytes
SHA-256: db7b3fc69457951cb1022ce5e76ba6a71191ea86cbd25e649800d82c567364f1
font_02_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1