Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baef1f3e56f31cb…

MALICIOUS

PDF

91.9 KB Created: 2021-07-18 11:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85c511830d4a3773e80272b38b4bc506 SHA-1: c5e2ceb31dfde391235d6aded96b875a258a7f5b SHA-256: 3baef1f3e56f31cbcc05c141f8d3bf2d223f77ebecc36ccd5ac43e6071a1cb87
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://dorfadvertising.com/ckfinder/userfiles/files/80824513121.pdf In PDF document text
    • http://wami.cc/data/files/70241940503.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pisowubatojarovazuz.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/gepidisonijosupituwe.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2dfdbeba1487e894948031ea9e443ef9/zujavupomozivavafanujuvem.pdfIn PDF document text
    • http://didopack.com/files/wirorufalirokumotarejute.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/50014264991.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zuvibapup.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4351bf75---novoworujejajijesagawepe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afc40c1738e---motapojeteferedunaxona.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a16efbd412a9d377c7d3793a83090ae/10296092053.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052320111573499.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e95e1db7---pederofelifil.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e058cc254f37de1d714fe6795d3b312f/69925248984.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/43133453188.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/magikigeganazifemowu.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nojilugorubozimakara.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/56ef973ede5e418e0423d2c8a48227a7/38698839688.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/mefiwefope.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lifavalefegajafik.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/71225870970.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/nubuxevix.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021053023310473499.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/sugedepuvifilaz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fq2er4s62h6t9obet4cqu1da80/83789330324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chaplet+of+humilityPDF 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_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 17020 bytes
SHA-256: aeae00d07663c08174c36fcce5d2c30afc0e34b1faf1197642a95e2f378c5844
font_02_sfnt_off00014a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9A 10496 bytes
SHA-256: 26d6a2340e0ae57c30db28135cc2ae62b37e39b986eb0e412d69e7e33fc5ba1f

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