Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bfc7aa53d199e1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 18:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6776b980be5908c9315da19ff987359 SHA-1: ab3e0583238ab2e37b2b343592c0fc8f8529d5fd SHA-256: d0bfc7aa53d199e19e452695719f371547b3842f01d51cc85f6a9aa83f2a82ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=brochure+pdf+audi+q5 PDF link annotation
    • http://be-now.pl/userfiles/file/petudijomax.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2f3ee2f7---71577684783.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/4403338024.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c02188324191ddb676ce6c8570d332c6/bokizaxeduwejamorovuwa.pdfIn PDF document text
    • https://digireg.si/upload/wejirigapuv.pdfIn PDF document text
    • https://etimes.mn/uploads/files/82926882526.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087636b2561f---54982923707.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/wukozevakagivibametu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d47d0b214---rifemifikebojam.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hse2p72cad22gh1hns8m8uvhu4/wegezigozesapumok.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nipitugofuwejijokupip.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tifilole.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/767cb113527775992759b0c8bfb34bb7/43332603144.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/93d8079a6ada8ebdc6b5ad6282ce7796/22897702213.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/83395192174.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e9e3ukrgn7jooccfdi57baeat4/ripotune.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7dohibdjcltte4poi9ld6pvjvo/pevofuvutawat.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb198437fd6---rirexemariguwesar.pdfIn PDF document text
    • https://khanikango.in/file/tuviwelemov.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/vavilakiwurerudukip.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/85978970325.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/46153517069.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bmeqntt48rlg5i63ocmfljv9sb/wokunuzedezudopuzuv.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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 17276 bytes
SHA-256: a864a54cdbf2c0e60a828c685bf2d15958abe9d6eda6b489fc9332aafea551ab
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 10736 bytes
SHA-256: 49f5c2c115c765ff6b077bb1071f91c8477648e3db1822fe858ce7fb6defdb0a

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