Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9caf32ea1ad480c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 09:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52784f935bac0390ed4ca44ad3be8892 SHA-1: fe6c392e7f4c4b486599246059d60ceb2b3be5a6 SHA-256: e9caf32ea1ad480cb310cbb7071aa788bc27da5d52bd7ada6b8fede31dfdfcbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, several of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://scamps.biz/userfiles/file/wilepisosufixud.pdf In PDF document text
    • http://faisaltowel.com/survey/userfiles/files/29324323428.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/40e8c870a5a9dc023f0cd7135f8560c6/7710806489.pdfIn PDF document text
    • http://schubert-hh.de/image/file/69326954540.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/29958296799.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/16291040091.pdfIn PDF document text
    • http://lecostationery.com/files/file/17963467978.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55c459124---gumiwoxujagoforiwuna.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/60358322966.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zejagudefa.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/bivifuxupaxufajivizom.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613890f33c890---xanimami.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/gudogutojuj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161439831a2c03---75719312069.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/pelidegojejilofe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613460b031b06---tibewa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gigapupulabufos.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kijaxomo.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/81317487433.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/gavobiwaliv.pdfIn PDF document text
    • http://indemo.pl/Image/files/vejovebaxot.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/47773460221.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dapurulematetenasubatug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+on+screen+gamepadPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 18320 bytes
SHA-256: f333b5b2660151ca122d5840e4638c5d25000b39ef5cb5551485ecf798b88cd8
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10692 bytes
SHA-256: 0ae3150281347342a265a0313a9327af37e7897e41ecd3800c8484c02be3ae9f

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