Malicious PDF — malware analysis report

Static analysis result for SHA-256 424d5ed3fb31f1da…

MALICIOUS

PDF

76.5 KB Created: 2021-08-29 02:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4b3bf168bff249f6011dcc4e2c0d398a SHA-1: 906360f2bb919605aa043f49fcf2d7ca60369224 SHA-256: 424d5ed3fb31f1da88e3583e15727286ff001c3b50391956beb9258788e4b0c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://uniroll.pl/user_images/file/tulow.pdf In PDF document text
    • http://ongnuocdenhat.com/upload/files/waniburorujuwo.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/69879459830.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1819d654---71908370099.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/60827680888.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f965fa25ad207395ed71d4a0eea70929/xoraberibod.pdfIn PDF document text
    • http://conexusinternational.com/ckfinder/userfiles/file/82355288315.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/bizezukur.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/50748814038.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2uk89pnhbeir94v60i1vglav22/26641631779.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/886dc767f52e9d52da21bc496c121174/41549908306.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/67881800740.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/nupolodiwed.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/noruxofejuvugopigip.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7059091b---bebomexan.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xekuloz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689c7c0034---lomedogobu.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/91182979772.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/jadabarujisofudojirotab.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/dijarokuvawoda.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/be666f350e69174fafe68707304434ba/42679386572.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/letoxob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=charlie+malayalam+movie+tamil+dubbedPDF 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_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 10692 bytes
SHA-256: 84e61f63c067a8b6c7dbf03a9c72337c4b425f1981cec3923ff54338a99623dc
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 19424 bytes
SHA-256: 785424f7c2278047510a7c85f10f197a66eeeeb5d660ab2be65509557369b60d
font_02_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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