Malicious PDF — malware analysis report

Static analysis result for SHA-256 7324a4a35678822b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 23:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994465e4253f4a7d0a42cb80f28bccd9 SHA-1: 9523e818b5ff4c6f7023ac02e70022b875e2bf8a SHA-256: 7324a4a35678822bd6a21f0309b2221cc338019f4cf630090b507d0a91b38cef
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest this PDF acts as a lure, likely for phishing or to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=quantitative+aptitude+questions+with+answers+pdf+for+bank+exams PDF link annotation
    • http://grandchainfamilyfoundation.org/clients/85333/File/6844102172.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jqlds0ltmj31qqphn2nvpfrbs3/99226418152.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/a1mvur1654lvet58p1unorgvbt/25179247103.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/rimijotokaluguzaredu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/adb6dc3d335c6ab0cf1eef18e3a62ca1/51676713211.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jozaxubevixotososobazo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf0901777---89298953867.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2a8c6f91205d19450bcd5e9ec392d939/xevosinapekuj.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b7b5a478---66607016967.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/12905319693.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/de51ce6239a369405774becbf94d5918/87369081026.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/83448849569.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/79841509470.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76db7d091---dezonujenamiwukar.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4864b347d4---7506231829.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/xiladodanonomox.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f16254e9332---ruvut.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/dozuredukogoxorugaxabi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/eeb683c9f3032f22bd1a04a2cfe55ffe/jilexegelib.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/80265718119.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8862ea20---xowekalabuzujozuk.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tejibezosovuwozonuxopoju.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0810952001620322625.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc77318918---80955634709.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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 18028 bytes
SHA-256: 7a26ef5f19d0b8c53fd163bdbc78bf74bffd9ecc40800f874335ad8edaad2d39
font_02_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 11508 bytes
SHA-256: e72edca1728cf8b883809a67dfbfa6bd338fe5a58775fa522bfca68d222ce9f4

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