Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4acc5f5d8fecc6…

MALICIOUS

PDF

109.1 KB Created: 2021-06-27 08:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12b2e0f64a84774ba6bb24295acb0e08 SHA-1: 5fa082b0bf73de528af6f6efa5c89b1ac4b2b36d SHA-256: 3f4acc5f5d8fecc6e5755feec7ffced585a4db13c95964035a40b02a06dbe465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ersatzmonitor.de/userfiles/file/91364570642.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0374f81---gamivodurumukaripukopedar.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xoledukivedonozatufefudi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/popavunovikif.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mb2limt2lsdd2kjm2fb5me876g/42381823832.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083f86b1274d---dijunalorofudodov.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/35592205124.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/urra5t98jvopjbs3s2pu6qm2ge/98888903873.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079277e44e78---wuvuvoxetu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072359cac874---gabipatirerowoka.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdc425b79---wegup.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb84fc4144---52078295282.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/78724868644.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c6l2tlk9lr41lfto2j18ehg1bf/48242438149.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfada007984---18006037837.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210601045105.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wogogijulaboje.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vh3qms1gv0mq8ssfhv6mdvk827/sazubelivuwodovi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/02ae7d5287d2c9066d8fd9f948b0caf6/zejozizolobizevevofetamo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e7ec56607511861602820bcb6c9a65dc/88076339473.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68c4e7a6b---lidopawabanebakami.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/em054rc7sfvu5so5d0s9rvrpu6/67901544952.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ucj8dh0kpodnbjj5hinorsbs26/4155148841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=neet+most+wanted+book+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 20348 bytes
SHA-256: 752d163a09d13515df5cac068f2ff8cd12a982ae02e02664301063c5c09b7b13
font_02_sfnt_off0001741e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741E 10864 bytes
SHA-256: 1e667f4b57466b4dd90f5bccc5e97d2baf7217d71064571be49f5c0c7563c92e
font_03_sfnt_off00018d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D0E 16880 bytes
SHA-256: 2256b5a9930c6fbe98c5f7b4652a511c2022bef710d274f61a4689245c011956

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