Malicious PDF — malware analysis report

Static analysis result for SHA-256 329a996603d17538…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96090bf2417613095e5acb53831c1745 SHA-1: a3d98ef799e9cd3856a11378965cfd7e022013a2 SHA-256: 329a996603d17538af98fe34d0a7a4b75d40fa80a05b765105ecca7a5a2f7315
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072102bc1f34---nimisudufu.pdf In PDF document text
    • https://faprosid.com/file/fivazerefutexux.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/71908342311.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/jupakafulisegawufuki.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109041133195305.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/fazapuditudaponol.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/66312300566.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869bfeb7a1d---25208510396.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/pakiko.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/nejulewopizifiduzovodin.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/varesekezo.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/pogexudufewil.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c430d8740---suzomikisemagovasabir.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89446543498.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c35c17168---83270238069.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd688bd174---66565824339.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5c4fb8bcc5a6c96152361720147b1652/66845748414.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/gewidudetokejiruj.pdfIn PDF document text
    • http://vucert.vn/uploads/files/18866121338.pdfIn PDF document text
    • http://fanghsin.com/uploads//files/202108071128101374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ubah+pdf+ke+word+ukuran+besarPDF 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 17868 bytes
SHA-256: 9271340e0199139c0296fee16e769de8d5a66e1432e2f1eb8660787d803e9dca
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 10784 bytes
SHA-256: e3f644c11342d869b9e1878498dd658d59856ff3b4875589eec8428bbb111c88

Open this report in the interactive analyzer, or submit your own file for analysis.