Malicious PDF — malware analysis report

Static analysis result for SHA-256 4476bf43bd4375e9…

MALICIOUS

PDF

89.7 KB Created: 2021-10-24 01:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac65e0d94dfb62839c09692fb7a2a13f SHA-1: f03674bfa1abcabade1d1c8a51ce94e97cd216ca SHA-256: 4476bf43bd4375e985ca21f5da4a267d7133805c8c1113863158f958a73b1dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO spamming operation. The presence of 'utm_term' in one URL indicates potential tracking or marketing-related redirection. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=complex+carbohydrates+list+for+weight+loss PDF link annotation
    • https://ducthai.vn/userfiles/file/tesarelurirukenevosew.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/niwukebo.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/74153942735.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/42371237996.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/6143730454.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/zakabuzefagowitepavemibe.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/tepanamad.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rrsd7fjfhtrlv6gqvs6hu2639e/60075757290.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/vuzukigexibedufefiwot.pdfIn PDF document text
    • https://miet.hu/kepek/sulevamojagojovuji.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/99ce10d53fb764cd174a9f3944654175/307423432.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/91d93fc164b6ec85ad9fc799795a0278/56783892370.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6f723ba1---33355746063.pdfIn PDF document text
    • https://sopkambing.com/contents/files/11485849310.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/bewufojan.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed14b06bb4---roposiduk.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sonotuf.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/09d024827d12780f2b8b3ac71a9b8955/37046841461.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/mixetiwafugutezis.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/72042401973.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/zakuwo.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/8438646691.pdfIn PDF document text
    • http://email-database.info/userfiles/file/72739453480.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/17379472857.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/vimovijovadabise.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021100717201473499.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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 11436 bytes
SHA-256: 10d451c61b955670c82a20acd43b8e14f1d4d762c8fcb8ae014fcc2078dd8b2b
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 20364 bytes
SHA-256: a37655d38bae93d90213871fab97c0621476528c8cad49c468b51996dc683214
font_02_sfnt_off00014115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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