Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc4017385b6b6a7…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 08:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57c4fad89715f1511fbe5d6502eb3740 SHA-1: f784faeda32bed9cc32d56e21b5918a0ed496c86 SHA-256: 7bc4017385b6b6a734fd74cfe2bb25f8829386a4efc49e47e6a9a5d46dd8551b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of these elements indicates a likely phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/46411265013.pdf In PDF document text
    • http://kiavysocina.cz/UserFiles/File/jogivisexefes.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/79256370341.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/jipikivurigofolomupa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc16ef20f---kepuwosejizaz.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/51211805402.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/sitofepeb.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/502755bb0cfaa49610c413456387351d/fovipidipewedupozujeb.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/niximaxebalabobafusovasu.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/51536426636.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/sakikotatolo.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/88772683969.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_2C569ED5A21D4FF2.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/17922498383.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed248c698---99795196980.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/76870771231.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/numibegirarum.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/53519526175.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/94085402887.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/21708929933.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/64790865282.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6137c1842c749.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/rivozibuvanevebepujomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=life+risking+romance+full+movie+onlinePDF 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_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 10796 bytes
SHA-256: e6a4cf28a65366521dd8d5ca05f235e03bdd710409d575f98ff8f53b9a706ba9
font_02_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 17328 bytes
SHA-256: ac49efa8e874b33c6a8380e4f638f540c93a3722eb99d137adae0afdf035dd36

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