Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdbd96aac3dbef6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 02:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b292f83b5a5a133b88f939aa06cbb80 SHA-1: 7b974607778ea16d718b8e60710e82a1947b6e81 SHA-256: 7bdbd96aac3dbef6c92d9bea858414162476720bf9ee819846993c5cbe5cc788
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and attempts to trick the user into downloading a password-protected archive, a common tactic to evade gateway security. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://daimarconstrucciones.com/images/admin/file/sevep.pdf In PDF document text
    • http://fruhmann-elektrotechnik.at/dejalerabutisujaxekod.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fesasuzavaxatemixofosu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/67ff91e1a08fa4cbc6a1cc42a0b427c4/67444276053.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350869af5b6---13663403954.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lesujebakejemujosomikesi.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/jojatoritasuwefugati.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110636044774.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/tanekixejitulizetus.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/noxekudi.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_232038.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tefejalofir.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/43677921121.pdfIn PDF document text
    • http://fygl.net/uploads/file/101953379662.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/55940446060.pdfIn PDF document text
    • http://tid.vn/upload/files/gigekevemapezis.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/52032003403.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/vagiso.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/widejiwonerexane.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/modosumukajazikotumobaj.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/44352855124.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sasabamewokesu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qoqk85tti96qgjs4ecdq3vec7/vuwirixajis.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/12924141055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+wwe2k18+for+ppssppPDF 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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 17424 bytes
SHA-256: 866ecb8e00aaa601690b16332f4599df364a065222e2d54c02418d2370754464
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 10860 bytes
SHA-256: e335a6ddf9211bce4134f556057fe49ed931b992225c28ec5f85c275a6c31802
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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