Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9faab2562d8ef9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 16:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9d242acb4e81dd57609471132227e8d SHA-1: 9da7291e7acbdf694377f4a582a8da22ae199557 SHA-256: 2a9faab2562d8ef9cb79a0a0078897ce06c52215e7879d564e5321ede8f720b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links and the high ML score support the classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://skncn.com/u/files/gosoboxuvupatu.pdf In PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/notositufumovuzolejitixuz.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/88939973272.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/17901308306.pdfIn PDF document text
    • http://ubest.ru/images/file/74765534213.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/34304231485.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6130e1ddeffa0785359d841113947db5/bogetexovulurijidofigeked.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9ab72d380312a6c8ad31047335fc6ffb/76283900921.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fawerigekilowopinofidel.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/wupekafilojemomo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f81a0703f0---bapobozatokibowuzukel.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tepoxabosivoba.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1876d99272---98162028926.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8ceec8be---vavavuregerokobibufugam.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/khb37k41pfqpmtq1gauats1nej/vimixoveburu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jinexowigafa.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/55620538711.pdfIn PDF document text
    • https://energooptima.hu/upload/File/talarawoneviviragonagar.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609477f9c9484---18619282878.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/fefejaxafomir.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/28354703393.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c556a28d291---vezizemu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00096a48c0---6923826787.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a907165036c---gosawemovaxirekozap.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6da83a4ddfb26256a5fa36b801dffb13/meliwuxiwajudoze.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/26532134041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=les+formes+juridiques+des+entreprises+au+senegal+pdfPDF link annotation
    • 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11176 bytes
SHA-256: 944547ec0a6f7df8b3866f1ea6cc23b6c9818d4fa67007b7b1c98066a652593c
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 20480 bytes
SHA-256: 8fe2a4acfa888ca714cad247ebc1a39a78c7d49930885ccb15be05acfe085ef0
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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