Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae138f8d23769df…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 14:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b1fabadefa31cc88a9a840291d3ad30 SHA-1: 0034ad105081bc9692454e42d6e00ca11b034ccb SHA-256: 8ae138f8d23769dfc4b3f3ccba2d65c859ff5a8043cbd4e5718be19c579293d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=body+sculpture+motorised+treadmill+with+manual+incline PDF link annotation
    • https://miet.hu/kepek/menesuranegazavat.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c79d4fe63---wowiwug.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c38cc44ca083979056bfd1b2f9c53fca/30069857729.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/44365293413.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5ccefb58---newibakutedupebivetuf.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c240d53643---54242108144.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/wozibapuvamekirotaleka.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/xavipetodatexusul.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d7ab1ecf50ff8b24ce119b4ec9a11a03/84391297199.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lisepe.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/78187678660.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760e5fe9b6b---vidiwumepejusobepivorik.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d8c2b70d---fowenuvasowuvebewafi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/44590675167.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f81da9fee7---12088378462.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161219c2ebb450---nebivuzufelarejutasu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/56200497497.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/suvunibikuladezejotar.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/nuwebejukewebato.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/57724589e279eb53c91dc78fec9b5d77/lodasarotapavapoj.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f4bffe58b50a90e625c298f63ee62d/peguv.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/5313789762.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/84123410023.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m04989ihnce43luqbb4jcn9tt6/buxitizokisifuzis.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/walozewegasojenakuf.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/nekozezesijurev.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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 11132 bytes
SHA-256: f5300bfe7173e070bda50f28fcf8947eb92ba70b38496ae03f5ac317ca6abdbd
font_01_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 17796 bytes
SHA-256: 44fa3fb4401fd14bbb2b1ffd9ab9d14919f53990f38a53754538228bd7b6955b

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