Malicious PDF — malware analysis report

Static analysis result for SHA-256 b655fb32cbf1dac1…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 18:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 411a286e7fa4301da19d4554127bc103 SHA-1: 191038d9866d1bf78e29bca36007f52d60f71b0a SHA-256: b655fb32cbf1dac18b2b23ece60b4409d56c67e1e11afb9b9b1c3c8aa7ea008b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=application+to+root+android+phone PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8a5alnfeg9m9o30nq655q97ht3/51270457325.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/65810192600.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/bupipopazuvuvegujinodoli.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gikajoxibifijezugeg.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/sufavuzi.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/kanovivopasiraxi.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/52649348613.pdfIn PDF document text
    • http://elitvorota.ru/f/file/79375440335.pdfIn PDF document text
    • http://4darchitecture.org/img/all/pasubuduwadewem.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/mejokiwilivovuwimi.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/linavomusijaduz.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/70500272456.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161406c20b7148---137383640.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f6e1c932827c8a484962d4635738b42f/nerafaviba.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/asc9nr8tq4fmrg6unl30sjgk66/sepokofadokolate.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gakezomusiketixefud.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/jiwenakexaxetiz.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/79680086325.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdf6df398e---72236567351.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/bivisupimaluwomomutar.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070813033844.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/50076270130.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/74684967257.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631179019.pdfIn PDF document text
    • https://ccskin.com/geektic/files/14612250915.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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 15816 bytes
SHA-256: 55334be0d8a5cccbd62a59cdf924cf3060cced665fc8c51b65303c6cd91262d6
font_01_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10424 bytes
SHA-256: 23b9e127e9843fad01736eba79d909ff693b6881e1d09cb3eec503cdf1915873
font_02_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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