Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf6a3cec10c40bc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 08:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dbcd22cab754b0e29324afb368c2a7ee SHA-1: 1434b3942dbdb5446cbed1e7e9b7f5d18d3a20f5 SHA-256: faf6a3cec10c40bcccf30cfa070f3bf73c5632063db27268dc2214a9d674a4ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on a variety of domains, many of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://firsatoyun.com/calisma2/files/uploads/feredubewipogekofaz.pdf In PDF document text
    • http://dezis.ru/uploads/files/kalazuzuxikomiw.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/830d41714ea72b715fd2902c985d08e2/jusebeju.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/tepudepewurirupowinovo.pdfIn PDF document text
    • http://bresky.cz/res/file/dodonegipikeniso.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/damusinulevoburidadopi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/3339674799.pdfIn PDF document text
    • https://partetesal.ir/data/file/45421269464.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191146441087.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/vovasar.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/15008952470.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/251910322316.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dilipufisenokage.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/63260243087.pdfIn PDF document text
    • http://sjanzee.nl/file/96003089211.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/93019139121.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/52752058920.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/jiserisigasiriju.pdfIn PDF document text
    • http://trieuduong.com/images/Download/tupemulugurutowovuke.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8fa0ba4e---3565504335.pdfIn PDF document text
    • http://flomojapan.com/upload/files/puzerojawitoletufozemofuj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de92edd352---towevesebopaf.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/diwunetomo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tuvamozopukakeganem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=romstation+pour+androidPDF 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10520 bytes
SHA-256: 435693d232a21f6e5b4668dbee102f3fb77acf54e2347da749c0d232334913b2
font_02_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 18420 bytes
SHA-256: 5b69cf7ce720946f9a01758735830987e4b348fddcaf0c8225ebed0ef5a6c241

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