Malicious PDF — malware analysis report

Static analysis result for SHA-256 604aa3681d41fcb7…

MALICIOUS

PDF

85.1 KB Created: 2021-07-26 11:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f835174f1b2a64bac56adbfa0a51995c SHA-1: 32886d944f3f34b8c2cc8f39fb2c9026513048a8 SHA-256: 604aa3681d41fcb785511669e7e6aec909305234b37b37d330b1b15ae85e8b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://martabaktelor.com/contents//files/83897554102.pdf In PDF document text
    • https://roc.mn/uploads/files/62264409149.pdfIn PDF document text
    • http://midel.me/userfiles/file/mebuxebixazafofirup.pdfIn PDF document text
    • https://ksuskalology.com/images/file/relajeliravarinur.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b6281194---jatefiput.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/92905067682.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526c406a5d---delatadivemutigagigalo.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/2462829416.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wafore.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/98555155655.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d35ed6f763365d2b7e6aa741e91c38ac/wapadofak.pdfIn PDF document text
    • http://cycling-software.com/files/file/86501046727.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1947db92a4b944faa869b505531e2380/79499307905.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6582390b67---32533751152.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49d51a400---biwupixaf.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/kazonivigabazasilajada.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6q7fo195m20v72uee7441csvl4/fopela.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f213ce906---92026363493.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb8f0361a---49321297224.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/kedofom.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+music+downloads+for+my+android+phonePDF 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 17132 bytes
SHA-256: 30c3b827c2ac8df8a52e0a9d8f67496c0075d7b2a8d472a2203f17f5cfb14531
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 11064 bytes
SHA-256: 10671436a3a08cdf7a5ec101750b4074e0f605ccfabd5394d2341cb18dd03762
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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