Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc57c39717a16392…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 13:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3c1fdb72e11e5e0c54f1e4004eab757 SHA-1: 31b5168126cf06dc077177c8c820785841aa8ca9 SHA-256: cc57c39717a16392c0d69d25ff3ccb9a268b859c0c91cdd4a7eba18681f074ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm characteristics align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ngor2-3.com/file_media/file_image/file/85570753761.pdf In PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/subogawivobisiwekabejut.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tasibo.pdfIn PDF document text
    • https://telorgabus.com/contents/files/49994536673.pdfIn PDF document text
    • http://annabarons.lv/files/files/lotujuxenagevugovabevaj.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jazevopazaxugutatogi.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/18915069486.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/25152444835.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109171150244730.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/sakufitokoz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea7518a2d---madetatuvigirejif.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/55474428434.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3a09b64b39f47655556c7c1762bf9997/11171537815.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/61874732292.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0fb2aa9e8c19d9e51f8325f7d8870967/28411287277.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/3402901162.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/57804019067.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35742700724.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371fadc42c3---jumidaxesijarirogerizejim.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/bazoletokowivofefeziwuzox.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gupitoxin.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/32162993203.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/mopus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=4k+movies+apk+downloadPDF 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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 17960 bytes
SHA-256: 489347a9040a7512ec5c6e7edc23e4c8703d0ce65e67b097da818390306d584e
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 10580 bytes
SHA-256: 3f117793bd2f27925ec3c4c2222dcf82ac6b55a4014dd636207fc2aace07da2d