Malicious PDF — malware analysis report

Static analysis result for SHA-256 135cfd820ea77279…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 05:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b29f9bf1fa31c1cd3332aac98b76e3cf SHA-1: 769e150667c17f7c5d222ca77ae0563789ad65ff SHA-256: 135cfd820ea77279e7bb1a26d8bf0fc575d8e4fb10ba464355d9be2afa82c634
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document's primary function appears to be acting as a link farm to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://catamma.ru/uplcv?utm_term=how+to+put+a+pdf+into+an+excel+document PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns1dca3gtcadesuutdnhc5n1j0/koxur.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/24307159582.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/xowogutepululow.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611881641dcde---66858030337.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/fufoxeninosuvavokukazefog.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/50813520829.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/85259254419.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/21048893516.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9dc8023db---52182981560.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zasejagukofobaroze.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/xojukufituzefobagiveziki.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/24386274139.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ec7b1ac86f03df481aa4e2aa2f3625a/26826203432.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/zoxolironuwobarodisofako.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f50df851bea---12186273280.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p46qijrhihomq1s16l8f63jiqv/ruzoxuko.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/1551465942.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vomogimujoreko.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/vajebeponenam.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d993bf2---31595640358.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/vunif.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/coo80430d9o0s31m1ei8cslbr1/tajiwebewumizakiwe.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/134033ab36682227e7e39447d6c25a6a/wotixuzelafekutivivisefis.pdfIn PDF document text
    • 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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 17060 bytes
SHA-256: c4b2f8e2a324b68c322e162d5a8e1fac7e4b89c0a8675500e7a90aac357cc65a
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 10792 bytes
SHA-256: 5704be698afd8994651474aff5b6d74f03d48069fdb6ac0e85bc7cf539b4d7cf
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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