Malicious PDF — malware analysis report

Static analysis result for SHA-256 57eeade670e128d7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 13:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb18d43524b5254b9e911b769a13c69f SHA-1: 0ee18781a463ee917347afab6b4a72981da224c0 SHA-256: 57eeade670e128d7d2e58764c04fa8eec7cd95bd02cda385e22587b8aeaec11d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document is part of a link farm hosted on potentially compromised or disposable domains, likely serving as a lure. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://hnhaa.com/userfiles/tnejp/files/nerotagozil.pdf In PDF document text
    • http://textstricker.de/benutzerdateien/dokatujimuwogawatin.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/24251909427.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rewezijabekorilamu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/10f6h8d0ju7feavo2h61do8nap/pavidaleb.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rd9ho20v5m7lv0nqoe04q53t07/52085540830.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/91988391213.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/lunamomozifowaviwa.pdfIn PDF document text
    • http://df-foundry.net/d/files/39436255240.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nisesirapasavugu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/fatose.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/37062025611.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/zonevazoxunisowulefugefi.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/91201508311.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/85362962372.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394a27b858---48469393118.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905010955.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435991ce1a3---pazori.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead3423536---82557421784.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139363469436---34151099667.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/54460122212.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135795a974ec---53491467911.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867f11ab81---43545803969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+unlock+your+android+tablet+when+you+forgot+the+passwordPDF 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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 17236 bytes
SHA-256: 7f677548c07603c2e7ba4cbe7925414c6de394a8cda29f74cdabbd4a55dc3e8c
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 11420 bytes
SHA-256: f53720bcf2d3129c024a7d78fbdd6643c424f3a79008812a7c05a8658bed89d0
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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