Malicious PDF — malware analysis report

Static analysis result for SHA-256 912d089970a078ad…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 03:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffab6f90ac317f05a924bad8207a56ee SHA-1: 089264b617052d86a2cc4147ef51a7772124a2d0 SHA-256: 912d089970a078ad22e7dc8b5863910b6a042827bce0e59770d82a5a1beef83a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=unique+words+starting+with+p PDF link annotation
    • http://ingpiazza.eu/userfiles/files/likagabulolog.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f623893817---mexuloxugisijigedofazimol.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/99246037775.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/virajotanilupedulubur.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/84326763254.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/ridogovop.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/81688677020.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/suwami.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/15450623502.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/58291966812.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/82158567230.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lotiboxojowoxepino.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d591b495b1---3437503077.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f977d893c---71896665333.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/62931167819.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_32CFA01D9EA765D8.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109080411143239.pdfIn PDF document text
    • http://robbes.nl/media/files/podevejoreserifomuxajenu.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/34903867798.pdfIn PDF document text
    • http://finchamauto.com/pics/37579381244.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/82075816133.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/wefuledizupadoj.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gotefamu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/90c929ca6a97c9f0fd1da29f52c924ac/nejesiponijexaj.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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16356 bytes
SHA-256: 416eba63d0f4ae5738596ac1fca7245cf48b513606c24319294219d02eae5f43
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10964 bytes
SHA-256: 6d7b23f7dab752e98b1a2a98b969f2c35864c1b109c3afca3f05096ddbd23d4c
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1