Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44420e8073a5869…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 08:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6c9f2541ec9f61613bc49c3e53c3321 SHA-1: 38efdc43f0b74655f19dfae704b46ced73498f85 SHA-256: f44420e8073a5869dd6e300a58db011e089ea5908ba180e716e1bcec03f8378f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious activity such as redirection or exploit execution. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://congseng.com/uploadfile/files/91185798522.pdf In PDF document text
    • https://marosme.ro/hirek/file/winijiwoworawufaf.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hre96chvcutr14ca88s2l0dfm6/40278724814.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/15782361673.pdfIn PDF document text
    • http://rayer.cn/d/files/43997404118.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/pijowefawowumi.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/740f1a63037afc36e7bf3d7eddc2ef6d/36908603995.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/3124958539.pdfIn PDF document text
    • http://amdind.com/userfiles/file/22764646117.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/sopupaxetixedak.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/36181479154.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161331289b8677---26125359176.pdfIn PDF document text
    • http://iltorg.ru/upload/file/rilosunenerulolasolizixir.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xalapebeko.pdfIn PDF document text
    • http://dentistturkey.com/image/files/jezomarumowirizugut.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210908141155.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dijejuf.pdfIn PDF document text
    • http://thevale.us/userimages/96687210730.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/5571854201.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613817671f448---rufodudetabiloz.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vorupubedevopiperom.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/33624152083.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xevulofebikegivenatajijew.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebec8b7ce3---lunejiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=koplayer+the+best+free+androidPDF 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_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 10840 bytes
SHA-256: ebcaf333e9a221f9214ac463b5559bc403afbb6dc2039398c06e88d2952ccbe8
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 17600 bytes
SHA-256: bd0a552f8714059009715dc059c2fca4f001ab96a654c23bac3ab86348551358

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