Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd31fc2f9c70e43…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af96a2410385db16e89c84d36dee6138 SHA-1: 2225d738275773626822757c81c305636d3d6537 SHA-256: 1bd31fc2f9c70e43bda3b35d3f2f20a843b37efe324195b96a8b55cdc94476b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=coloros+7+download+apk PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdea02a00---30610918622.pdfIn PDF document text
    • http://alptw.com/images/files/limum.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902063811.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40874422174.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79863709723.pdfIn PDF document text
    • https://empresa-venta.hr/files/73008904505.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/mulunekorokak.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/49290804038.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lowemoboxe.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/daronurid.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/ritujevexosuderib.pdfIn PDF document text
    • http://newshop.jp/archive/file/58666192312.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/54265405790.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/43708714377.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4c5dc887f---tevedebedovidovugus.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/13254759145.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/gajewofudaw.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/tigepetumo.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210904002757.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/4249292316.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/ximovajutoruw.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/pasomonopozujate.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1d5994939f53529f44c6c894f36fed64/dujatosorulodup.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/bisilazedademix.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 20608 bytes
SHA-256: b4ce9b88748d5e4507f9e9e130da96305af29d3d0a520fa3d375599d9d105976
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10324 bytes
SHA-256: f626fdb42e8eb7220036becb54d8ba7ea722b701af725198302f5b0fac365375
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1