Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a330aff894e79e…

MALICIOUS

PDF

79.0 KB Created: 2021-10-12 14:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c75e1cab3a9941a2e659feecaf169295 SHA-1: 35759952fc31c0532d898edf5a4d457e6e3026fb SHA-256: 45a330aff894e79e4a55edb6486a8cba7143dcf2f4e9edd452aabaffa6469bb2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://language-coach.pl/uploads/files/gowewativogiserasaxijoziz.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/ruxizamula.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c37034f840---kumezarizezeveladasi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/boxaguxamelinowogidamel.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6fc8cc643---moxokulasozigomepuluzuwot.pdfIn PDF document text
    • http://hbaoge.com/upload/files/42180067080.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614db0bd5d922---wufefisawarut.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/39018999499.pdfIn PDF document text
    • http://myesen.life/userfiles/file/76370243850.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/45ge4brvg46flsl0l7pfs8gu5n/59936095476.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161516a3775a0c---35772326924.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/doxebafugobotilokulamubov.pdfIn PDF document text
    • http://podarox.ru/public/files/gakelefozaluru.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1c02f035---gatogefemozebonafa.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/37083707867.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/sulovubadonomelusotefov.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/81483181476.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b3091303df5be9257a900383d1157caf/woketamigenabematenonire.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/ruboxifinofewimidolu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/28374844710.pdfIn PDF document text
    • http://mutitar.com/user_img/files/9257759338.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=someday+never+comesPDF 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_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 18068 bytes
SHA-256: 2015dfb9c5e5e359dcb9bca6031c8195423fb1c2507fd868203e939589ddead8
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10552 bytes
SHA-256: 2eb9223642ed7e3fd20b9431353dde761e303fc6b7e6bb58623f65a14906eb44
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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