Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ba86623cb0dcf9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 22:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c1ab3103d6205007d0d501aab3b35c SHA-1: ef44147940b516c386ae3d38b838e9f2c20cc07b SHA-256: f4ba86623cb0dcf91112bf143e82d996d3d63f4d253009deddb7d9c79a0a1849
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=ps+editing+app+apk+download PDF link annotation
    • http://neoneofitou.com/ckfinder/userfiles/files/74343539507.pdfIn PDF document text
    • http://exosushi.com/uploads/files/10157436427.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3c96cb8e---tiwosimipi.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/zumogifixawuzo.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/27560103866.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae81b7343---74422676281.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/vofijurip.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/vafuzaxunubovalusibe.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/mimojisabefos.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/muxixep.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb57160fd---mobopezise.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/71024309658.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gimexun.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/jisegekofa.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/37152459045.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/gumesije.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2iesq2c7c7chpgr5fi6opbm2g8/boweserozegipipuvesemame.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138037e1bcdb---folefawoxusivexa.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/39489113813.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/5470949475.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/81498678798.pdfIn PDF document text
    • http://puisan.ru/uploads/file/vafofudulaxuwezopetojujo.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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 19108 bytes
SHA-256: c3ffa1abcb77fdc0f9bfe530083c279d3f59eeea8bb1b85e041b39ae439f3505
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10648 bytes
SHA-256: 57936ddde4f7bbe525dbd604b6069fde1f977cb471547cbc1172d8cc167832c2
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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