Malicious PDF — malware analysis report

Static analysis result for SHA-256 016d7cbfd0c8da22…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 08:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08ccefd127f2f33c84650000a287206e SHA-1: f919ec95305d92393ac8709becb4946f5913f412 SHA-256: 016d7cbfd0c8da22c0756c8d4619d02913e9d7d93679d650106481d9b82337c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7032

Heuristics 5

  • 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
  • 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://chonburi33.com/userfiles/file/gijegawanoxuwimabikorare.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/vefepake.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/perinapiworipetifalasufo.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/82566186486.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///paziwawamogip.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/8344203991.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/55543015842.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e2c6f547---86062167048.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/63347050301.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/sepopuzi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/dapufalaxavidaxeji.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/lewuribod.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/58712385474.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/gifipemuxirot.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nigalu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e8686956---29879705441.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/xabajalixew.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066fd9ec37---zunikewogeto.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/70126222226.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/33484875873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=indian+idol+winner+2021+season+12PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 17900 bytes
SHA-256: d378445d46c15f8c39a9f24ab5081389729a8c0c4cb394749769c75fceedfd38

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