Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f1f6b1bf246031…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 17:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ceba614b2c26fb5b3ef4d4695424b6e SHA-1: 726278a0d3636eedc2b3c15025ee0bd9848ad3f6 SHA-256: 13f1f6b1bf2460316e0aa62f1c58fea4ad5a604e979903aad69c55c6af4f79d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=famoid+free+instagram PDF link annotation
    • http://sinhorelli.com/userfiles/file/xabujimajomazifudejor.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/32352576708.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/fejuw.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/41940644881.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/suzur.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/66543198080.pdfIn PDF document text
    • http://theponghop.com/upload/files/80455975335.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345acc2a761---rifulobafixigawovisetiz.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/59992719615.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/7508404887.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ntqjqgtciu44ova5c3ud81rb23/gelebebeserek.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/gulukufunovikedekowezet.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/2785979234.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/35329973464.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/64892232616.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/81452994261.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/joxusewemulanilir.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/27965397188.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138da941b684---85845335766.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/18188194189.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/88051392295.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/66664871505.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/29670456449.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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 17688 bytes
SHA-256: aeea5e2b6eda8c88d2eb388abab9aae86672ed334316c3c6820e64d8798b16dd
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 10628 bytes
SHA-256: 6e24c2aee0d1c5606bdac0fe9d17728116c48d2f8bb8f5ff0c155e830a74bf05

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