Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c73207ed043fa0…

MALICIOUS

PDF

95.3 KB Created: 2021-08-09 14:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 805ed82edb90902b4f7816ba6c4d9400 SHA-1: 41c8dc23ef88591771d4919263960f3faf23ba28 SHA-256: b4c73207ed043fa0f4cf0cd12c14a3cabedb19d60a3ff05fdb474a7fc4ef8328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=curriculum+vitae+europeo+francese+da+compilare PDF link annotation
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7d7b159ae6ef0eaff7aa49209dba0159/xufoxukerujinugoraxuxireb.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tozubus.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pisogu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/2270a2c09dfca12a718ba7a2eb4bb78e.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0926cfc445dacdef407dec3d94701713/bebekinarotakagiwusi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2nsik206vst2qvv5bmpj738df1/bakirorejelafizerojij.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/29826817062.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7397a3ad---fexiko.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/84083614383.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rutagerom.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c20ee39951f---98072507549.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/6651716296.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608878551f892---48149319633.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/borata.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/2824966657.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cbf9ab8e---viragulofutarikodel.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gavapofugomabop.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87720021271.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071818075373499.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/nafewovevukaxibiv.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h6s9jrat8u72b7oie0rkc2plt7/97047283439.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b678f7594d0---158821940.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b4b25e8599dffcbc026c7ba7e4ce2f3/vexumobitebizazezediladi.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_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 10976 bytes
SHA-256: 4a9d1b180412a13f5ec421851a7e6e24cee6f37c205b01ebf8bcf56e727a1baf
font_02_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 18828 bytes
SHA-256: 8bd0c55c95296faad4db16fea1822254c02acbc4eb325683ad7ad9cfacb48c7c

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