Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b63f68e8a8d8f3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 03:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e14b4b984b29daec093c4ca1294d6498 SHA-1: e69e7cd0e2bc2ebeb9acf09b5c2afb215ade1ba5 SHA-256: a1b63f68e8a8d8f32845a513264218d5c0c44ba656314e82bfa4935f6f26792c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=fear+of+water+is+called PDF link annotation
    • http://jcon-aps.dk/userfiles/file/87443988030.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba78a33064d---sametilob.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcd5c878e---1614348506.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f273f39316---93000416860.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec7355172---44236597154.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f7f7r9fn35v63t7f89pgfsqv58/76564708729.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/jaxakegefigoworexit.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/11496246792.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e8c7a8a42---xajajanamajuse.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e0bb1949a50829ec3bf0f49b06837d3c/gemuwoxiwefodasivetitun.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e6d8c91579376acaaa4fbb037031e866/bibovomibu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/38760387627.pdfIn PDF document text
    • https://sharenkon.com/files/towamikubepovigopu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/9379446921.pdfIn PDF document text
    • http://royalgroup.at/tmp/jeviwemukozefap.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/mufiwudinepiluduzusajala.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rimr1utaj77leqslff79p8njkp/39867004732.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/26415731393.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7ea72b27nogkh31mjko5rpjo91/75118231688.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/nofagaforaxi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/babodelunojekik.pdfIn PDF document text
    • http://salt17.com/userfiles/files/savefativexe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/48574c8cf083eac1bbb0ede263677b80/mapositejug.pdfIn PDF document text
    • https://4appsoftware.it/file/nonepebowubexokim.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 10428 bytes
SHA-256: 8460e9be570a6fe27d4b4aaa79c92b9af087cb325aeb0285a9acaf26d2c49096
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17000 bytes
SHA-256: 66533b63fb40dde1a9438fd76e9e0ef63b06b4e2d5daeb2d911f7a083fe71fbc
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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