Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c67439e0bb734e6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 07:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d224c3772e5ddb79685937af5c6ae63e SHA-1: 5807bbe535817d8ab85b8dad38a75d245a795a28 SHA-256: 4c67439e0bb734e6f2b5a70441a43b625a0badfb193369396806601f12f6e6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity, likely involving embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://onwater.my/uploads/file/32066514463.pdf In PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/42998182531.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pewimegebirevoxavelukep.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/6308498023.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lunituxawasosix.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lesegimefuve.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/429382fc63c9246115bb42fe30992bb2/10425752780.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/zejixaruxuvew.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6feb1887---nojeb.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/66672376921.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/11808807731.pdfIn PDF document text
    • http://greenbrier101.com/userimages/62724151262.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/69f4c392c8d90fda4248ed949882bb6c.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/xepumazemulebejopavimo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/falivuvolaberixoromisajit.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/33c950dcade93cb09216ba1cdabd0f19/27924132232.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/92110578401.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/84800990996.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/68315027576.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1adcbbced83355adbb6fb002980553ab/wawazusugo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/27801244017.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1ad1a15f---87463806004.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161270dc21f429---forewejipanoje.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8079bcf6e3d91c575c37f2a474564e7c/4160788203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tricky+sql+query+interview+questionsPDF 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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10628 bytes
SHA-256: 044b36591ca8144650c88e86f1587e9229e473dd9a063c1f4c68ee03c53aa3d3
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 17548 bytes
SHA-256: bca00e79fc8463e7b06a297b01e167fce912b27c7b836ca6cfdef4f715bdb2e8