Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6824656592473…

MALICIOUS

PDF

101.9 KB Created: 2021-08-21 17:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 027d1df4b4282f36cd0860a5c74aa298 SHA-1: f0933537ae0951cbf8c3c3be190997bcf2cd8a69 SHA-256: 26a6824656592473c4f2b6b0cf133a0350408a0e7f39ae050eecc1ac1f00f918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://krisoc.ru/uplcv?utm_term=definicion+de+aguda+llana+esdrujula+y+sobresdr%C3%BAjula PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6652418b9e70aa7ebda4132eee07b605/45692387863.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/51354030877.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wononewofi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3a1cc89dd7894a1c4d150c07361054c9/65856645722.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/89202439546.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece459fe5d---xamixeluzevuburuxoj.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/22247386055.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c92759691---88639494754.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/15509945180.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nonuberagetuxidozije.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/11297293115.pdfIn PDF document text
    • http://www.moyekolodin.com/files/36390679805.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/99935094872.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/kadafiz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e053c70f21d---sojawinofanuzubaxalumebu.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/pezojaxo.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/bujudanelupujun.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/27024269184.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/10503809725.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/sefawibevapewomujir.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/44390059549.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/cb23fefd386758783c3a7170f3b2cca8/jilituxipefulikepebabef.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_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 11156 bytes
SHA-256: c833ce157080639e6d8bdd42996c941ca42bfa4b77506e4f37c08599685e7e44
font_01_sfnt_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 20352 bytes
SHA-256: 37f00d6fade08f4b894a824f5b8e5d9bcc6cad478427363ffdf1fe1882ddd001
font_02_sfnt_off00016ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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