Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d2cf872e80236c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-14 17:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9a8ef8a1559413110ccc24e093c8dca1 SHA-1: c92ef23165dd313f66286b5c449fdefed58abe4a SHA-256: 52d2cf872e80236c952807ded6010419600814d0c2e662a23fb9c4c27938c9a0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt 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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ffdfpav8ol3mp5fs0qsdrtqh6/39472101787.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/bepor.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/kitorujedupulatedogesukos.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ledenapowunifeluzuseruja.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285a56e1ad---winubosajaxakofibawugete.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/jikibotirimewemov.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fusubibabawitovago.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/72725695598.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090521434473499.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/vidaziberurudeviwaja.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/78469714023.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/84964989244.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/48708610951.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xevemudimaku.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/mobepunujupopulami.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f368fe6552ef0a837eca960a61656354/mivikuravawefoketu.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/66815111313.pdfIn PDF document text
    • https://majubesar.org/contents/files/19765697623.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/75665663812.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/359880790.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/89006800717.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/88910669980.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/92145956880.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/sanajoxebuwanugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=photo+and+video+and+audio+recovery+deleted+proPDF 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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 15088 bytes
SHA-256: 6265311bf93e72d08062b4b60772d1eb8891343a6b3b435586009310c9f2d74a
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10724 bytes
SHA-256: 0065c2e35309bfa4a8123f6691921ee72a8faffda056225c66c140c87fd268a9