Malicious PDF — malware analysis report

Static analysis result for SHA-256 3749a9593f761185…

MALICIOUS

PDF

71.0 KB Created: 2021-07-14 03:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a20ce5ff5459e7d3cafd1c35f6b75f4 SHA-1: c22fd1bd355627fbeea35348f3b9c32db7df5f1a SHA-256: 3749a9593f761185bfdfe5a3751115925d82a08c49754ebe78485cddb67b8ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised or disposable infrastructure. This pattern is often used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yishiweb.com/upfiles/files/20210707_174906.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/gipisunizuwetagerebepev.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0a2b1858---10137155969.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://congchung7.com/upload/file/rurarofidozokasosat.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/48508299961.pdfIn PDF document text
    • https://red-adlay.com/upload/files/82978142408.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/xuxupukevugasewedelalubi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b0594fed9e3dd548eb8dd5154f790fb5/mamerawimumirobevamemigu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3283cf544bcaaf10c92bdec29b069f69/zaxakisim.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/2346859774.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/dotelitidunoxi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/41893791962.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6906133ecd---75434709182.pdfIn PDF document text
    • http://omg.su/upload/File/dubimemurilinuguret.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/wobefe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ku8huf76kvobi8kb25llcli3h3/15069817133.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d89189637---83744039306.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe555c059f055335720672f385a22fc8/6084277610.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a462c7940---bofetigusi.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/46083058322.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/lakogevojo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb79b19699---31486300463.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/25912109566.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/rematenikanerebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=html+button+actionPDF 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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 15652 bytes
SHA-256: 90ff3a296214d3682f835cc6c7def746f6cd6a22b4a08001d87d82a088d82278
font_01_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10220 bytes
SHA-256: 789763c2e30b143194c0384ac1c2eb3272b22e3714621ff29c8e7a976e775427

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