Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f680c6845a8459a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 04:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1021e79e061d798288639c30605e7035 SHA-1: f9d8a12ec8de6137608bf9452c4dd4aa694c0230 SHA-256: 1f680c6845a8459a588bcacc4c5008859e145b74247c26d96bfe64269306ca31
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to malicious content or phishing pages, aligning with the characteristics of a phishing campaign delivered via a document attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=largest+natural+gas+reserves+in+the+world PDF link annotation
    • http://kuhomania.ru/ckfinder/userfiles/files/tolizo.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/femugazije.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/80064921185.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161417d462dd34---lejigaxamisupexabokatesej.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/selapotiseb.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/redumutevefuxena.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/36307646029.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/903f23c032e540071098870c2d5ddd9b/lujidiniwam.pdfIn PDF document text
    • https://clickbox.ro/images/file/88877957689.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210910035432.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/1590196240.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7a7838ea---pogirus.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/55396711463.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/mipovezapatagunob.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/68267955048.pdfIn PDF document text
    • http://equalitas.es/userfiles/file/52031257780.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/palajisivoraja.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/diwegu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbcbe44d31---32356541763.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/53953799894.pdfIn PDF document text
    • http://juha.be/_files/file/80144464070.pdfIn PDF document text
    • http://mestan.by/images/file/61750755429.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 10736 bytes
SHA-256: d9968e9760975943e18876da5c5964c973da0ce8a9521f4e1edd2e6e9e1c1cca
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 17924 bytes
SHA-256: bd740dee9c626fd88830124f1ccfcfd096abfda276deb6c834e581fd9e29697f
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1