Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb3f84a2e99a032…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33f7cb5c36e3f85ee3bb63330329396e SHA-1: c3a084f862bdf1366e77ab10dc5ce0145926dac9 SHA-256: eeb3f84a2e99a0326f031a5111b7836956b4bcdb2ba63698d7d5ae3129a924a3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery information. Numerous URLs were extracted, many pointing to compromised websites or link farms, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://cerezolorente.com/files/cerezolorente/_repo/file/25478372203.pdf In PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/xemodokujim.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xekijiwom.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/47059323391.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/17522274540.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vedijapapuzirokidozo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161376ef0dfaae---xiwaxikumujezoxevobaxa.pdfIn PDF document text
    • https://melz-feu.ru/upload/rebiwefekezunovuwameviwik.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72025689816.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/49151327451.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_145934_100.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/67166722543.pdfIn PDF document text
    • http://madeirashopping.com/userfiles/file/xokobumudazowivap.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/65100336428.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gimupej.pdfIn PDF document text
    • https://armenia4d.com/contents/files/68574118806.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/vejigezobuwekonuvupedite.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c041061583---metupabikivokejuti.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8365dbb6---87425265656.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/tanafojurimereg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=happy+wheels+download+for+windows+7PDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10740 bytes
SHA-256: 320bfcabcfb4eca2b4d3fb2aba522b96c03c44125cf390e13e87c05ee406b8ab
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16968 bytes
SHA-256: fb024fa0df2a0eba28604bf80e4a5b392a026bdf17b07e6de233bc6dd45de2f0
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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