Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d15ea296bf7e8…

MALICIOUS

PDF

80.1 KB Created: 2021-08-07 10:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d443bf49277dabe7492295515d16fb8f SHA-1: 8771bd2955a5ce7862994e38ab095587ec07555e SHA-256: d58d15ea296bf7e8a66a6335558aa9fba9ecd479b570b86354ca4329cf019ef1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further malicious PDFs. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102ff258987e---19113126018.pdf In PDF document text
    • http://le-bouquet.be/userfiles/files/musifonawunofusajimi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9599b79dd0a5fec93b9add951a9c6c3c/65939470635.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fqs01jejsgq3c7m9ihvspbmja6/22954038986.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/gekelogibetevokobowadewom.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/79143373026.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/59499157210.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/66560339132.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81afe3551---tufatinesazarugelibi.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/57284831778.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/83192529466.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af72d3141---54002409381.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/82312490682.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210619192514.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6ffd74a409e7510db0bb223f15e32733/dimaterebuzesapem.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100669a876a3---negige.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/dejumajoxogarafafezizumot.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/56046162340.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/ladufakut.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/10500930781.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b133f44f65c---timurapujopizuwute.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dudiwu.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/82824471890.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/32693621336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dbz+ttt+2+iso+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 10416 bytes
SHA-256: 4a4f21879dead83be80b9c958643f75d6368e9e4cf80292567d967b5724cd80d
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 17592 bytes
SHA-256: 2e18fe978802143051bcafdfa5edb61d78307a42620b573a232b494f1c2b7287