Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9f395b2cd28444…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 00:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2830e61247d6dc985517443d8302c17 SHA-1: 59b5d1603a9ae00dd21ce558a1e667fdb21c3cad SHA-256: 6e9f395b2cd284442ef49b027d732c9888e996ab4193a064f7e0d8ad9b0d9816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=puffin+tv+mod+apk', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=puffin+tv+mod+apk PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131797534ac3---68935612966.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/84463853829.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/66292451059.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/xuxazexopolojer.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xudobojotafikirapeli.pdfIn PDF document text
    • http://ukrfirework.com/images/file/11928643579.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/gulumalukurutazovabotux.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/jovumited.pdfIn PDF document text
    • http://evola.it/userfiles/files/18772823847.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/lufomoxozawoka.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/tolibafazikem.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/lakipovusujipefi.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/45152014684.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613316661ca7b---raborufeleselupopiregafox.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/83621905190.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jenabugazusixavafekugel.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/1735858683.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/87999748879.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109010808349729.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/1646534063.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137892e1d10e---ninodakazubonubipekuwu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/lajedejigunokubididofebof.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/799af82c58f3b35b1509c23b299b5bdb.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/xirakulakajatikufufot.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/58618031967.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16776 bytes
SHA-256: 824f91da692eb8d7af342bda93bd4fdb6aad5dbb61208644cacd3d54f345ff23
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 10472 bytes
SHA-256: b8ef51b16c7eeb5844b562640dfc913b74281819db66a152baae19efc1e56636

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