Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efb144e3f9ab4e3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 14:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ad459d9097f4e84c97875246a9a8136 SHA-1: 92d0b6ea4c2b576327a18dc90ea2ec4715b156f8 SHA-256: 2efb144e3f9ab4e3809ced4f1d2afe8f2db02100f18a4b10fdd1dd384911b70e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096aed386f7d---gixejabo.pdf In PDF document text
    • http://cementfeet.com/userfiles/file/fokexujifu.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_045000.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/31394899032.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/15958255437.pdfIn PDF document text
    • https://olterus.org/contents/files/96791162934.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/54177601.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b4576a34411798a6fcfc3e207dfbc40e/46970578093.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/nerabozatumiravak.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/95542251114.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/25870551976.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nen1r7ijnqr0rvnb9gpsnd6g98/77173395993.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dla44euj2pi124mknbvab6ijf1/suvusaviditin.pdfIn PDF document text
    • https://equalland.com/uploads/File/46289987895.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tajonufipugefudijisub.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/rowew.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/99811115116.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/25751648498.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g88a3idaaa0s3tvbq1uqm8lo43/59636749164.pdfIn PDF document text
    • http://halaljones.com/uploads/files/kivokupalu.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pegoxoruwolevuvenatotaso.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zukef.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/96904221507.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/74926829507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=york+air+conditioner+manual+troubleshootingPDF 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 11132 bytes
SHA-256: 1bb8e6ca5557bfc5cefb2b4a00306c86b61ec4e83e595997722563515617bc2b
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 17380 bytes
SHA-256: a8e37bc129aee1f8013e5bae655d488939f5f3f9e015ca7ed3048fe08159a9fc
font_02_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1