Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57e987e6805db67…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 10:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f35699fab879d8a8c0f15637f34f511 SHA-1: 7db1aeab7eee6fb4fb69ad513335780014944b92 SHA-256: a57e987e6805db670b6a070c98019d3ff6d0fd34a604e459a1c694cd737d8667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further payloads or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://vksraja.in/fckeditor/upload/file/21305653757.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lcile5s4b6c4ob7fa6qf5arj0r/buguw.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/sipopanegepusoba.pdfIn PDF document text
    • http://ducnhua.com/upload/files/48717978644.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37f95309f---33048495985.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7gde8b8h017ps8a96eaqd2jb9s/rorukixarozu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/259b94deb0dc4c824538718ef4a393b0/366395539.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bugare.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/29935935118.pdfIn PDF document text
    • http://zl369.net/userfiles/file/90554383166.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/ruvafojimon.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f7d86713f79a0091f9191d6624dcdd45/18705988277.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9f27bb499238cdeeeb2ac7a1955c147e/36607792828.pdfIn PDF document text
    • http://beiks.info/public/file/petiragozaxenusekumiw.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/sosesaxox.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16273808171697535678.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/furetorewi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jumasusulow.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/i1o39l5i3lsno41qij2567pfs3/xazetaxe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fc292b5210d1beeeeb124808f78595f0/79658350817.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/651d8b0e3dc0cc0f5aacf0eee239819a/99936011891.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b65cea11d---dozebet.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vtqi3b6fbnd6ptdhe2j86otfjo/83468057668.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/45852984972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=yasmin+from+towiePDF 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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 18796 bytes
SHA-256: 7304390717c3092a46ec0eaf511f057d2482f0e31f0501d861fa9e94fe3fc7f2
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 10400 bytes
SHA-256: 6e24acedda67ed0d36dac43652b320e2632f9d81fb07952fd875b20e62262cc2