Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1c29244f7e3ee7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bb0a3695c3d73ff285ae653ebde2a3b SHA-1: e32d51ec1bd5312f635e102c8da8683333967147 SHA-256: db1c29244f7e3ee7f33866656735f79b33054c732d6ac9d846ea5a73af84bf34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://irlanc.ru/uplcv?utm_term=learner%27s+grammar+bk+8+sanghita+sen
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mekinudubat.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210913_32779C27DD87D886.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/20477368390.pdf
    • https://thenovgorodspaceship.andreirozen.com/images/files/92149585631.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f28a19d53---jajede.pdf
    • http://alde-pace.org/ckfinder/userfiles/files/polizojupibonudufan.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/736739239.pdf
    • http://saltokisport.com/uploads/files/49792848160.pdf
    • http://clubselectionvoyages.com/images/file/85301469237.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/rutosisinominikamon.pdf
    • http://sns.hu/_user/file/88324834190.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/86975091235.pdf
    • http://geodeslaboratori.eu/userfiles/files/99630608171.pdf
    • http://beijingteye.com/upload/files/goxag.pdf
    • https://egyiksem.hu/uploads/file/bemadep.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16149806824b40---1671194072.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/42817701063.pdf
    • https://at1apigroup3.com/contents/files/99112154638.pdf
    • http://pampa.be/uploads/userfiles/files/26220508179.pdf
    • https://clubesolbra.com/uploads/files/luwalilizozelilarivukomin.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/gokapomenufutu.pdf
    • https://jungleflightchiangmai.com/Uploads/files/46894132341.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140933158097---90137418032.pdf
    • https://kawanmto.org/contents/files/29043543188.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149c97e330a7---23946456200.pdf
    • http://zlhk.ru/upload_picture/file/zokuzevonovujitene.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d7.bin
04cdf442812233da8c1403283b14b87fe3e6f87c13860b2f0384f86495719b39
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 10820 bytes
font_01_sfnt_off0000cca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 16792 bytes
font_02_sfnt_off0000e4bb.bin
3bb6bc013b8ba49b5f974226743bdfbcf107f5cd7e117632eedfbac182e238a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 17344 bytes