Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a6520b4e11392f…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 13:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a421d1a5b5b8a9b330e09660a1b23be SHA-1: 433ececf3f49f35f0f065ae3a1d792d32e47b750 SHA-256: 56a6520b4e11392fea6f4f02291824c32bd4300ef769cecb014112f84dc9c594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=calling+a+lyft+for+someone+else PDF link annotation
    • https://datatech-int.com/userfiles/file/wokasaged.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/27368047046.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608284434b28e---99638639140.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9a68cc29---54678459439.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/watodefadomatisov.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/jusavenebusizujul.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a0010b01---misiz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/19520054187.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/2862347913.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/29660004470.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/70046099403.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lofasizabetaputomage.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kobesixuwejonofafagosa.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/vowevulikipevazejefebe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075baf83fa9b---lazopasoloruvezi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ff3d12e7---zelutomufajowejigutimuw.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6a5adfhnbriikqniv141kgabhh/35911178028.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e85b0517f7e9b58a57e2dd493ea681a8/47272633620.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cvelki2q0m4nbqgn6u9tkrr6q1/vezabo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xopazonuludapiwumiso.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zupeputan.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/7328740064.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/48925442292.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/8923530032.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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10704 bytes
SHA-256: c565b2bbe2af5fedc8a1ef48add9785a566bba2f567787707ba54800670069b1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 17252 bytes
SHA-256: a961fd572a2f7febc3bcceb1c97f990e1406a89974c067822f30fd1b8fa72aee

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