Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b703bbb5b1285b…

MALICIOUS

PDF

73.5 KB Created: 2021-10-08 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e22ec43ea79e6268edab92f1c20cca3e SHA-1: dae77b95f4640a0358f7223c77dfe2932781d47f SHA-256: 79b703bbb5b1285b28df088e322f0f9bf283e9276c179b123f3f230607754469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered link farms on disposable hosting, suggesting an attempt to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://archism.ru/uplcv?utm_term=microsoft+wedge+touch+mouse+manual PDF link annotation
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/kejononeteta.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3d95274bfdd63e81fbbcf7c1ced599b9/solug.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/tatuxijoselojanotig.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7b9f3ff3a---6670341464.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/159161153961369a72325af.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/womopidudenunemobaduv.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/papurumomaditokofofamumuv.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/39626195182.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/46973686920.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/wavebid.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/81133701741.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jasigokodiwepemekumaja.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bagaxarumixutubo.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/vopijotojevis.pdfIn PDF document text
    • http://bharatceramics.in/ckfinder/userfiles/files/53499050790.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/72174972776.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/gegawulelikidafujararef.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135537cd412a---mizuk.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/97344090967.pdfIn PDF document text
    • http://saint-party.com/media/file/8348923510.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • http://art-ball.net/files/file/kikubejuzuvapexe.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/743446816fcc40f0a74edb6eca38b701/79228629306.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/duzewudurunikanuwipov.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/jebakejixebimamokajubu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/tudokupafasovirufepibedir.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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 16448 bytes
SHA-256: 1771a51c7640d4114d0c59de6e648a44b1bf06489230db2be0229536b2d969ff
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 11104 bytes
SHA-256: d30b5805c5c633cda0af250d473e27a055bcba7436125cbe0b6d0f7c34fb1d85

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