Malicious PDF — malware analysis report

Static analysis result for SHA-256 3523499373461d9f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 05:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c00e58b4e59f18b599f00eb51cb9d8c SHA-1: 0fdfac7238059dea1afd992d929d1f49af75a195 SHA-256: 3523499373461d9f4a4eff0b9c13fa152fcce7533698e31e86648d89d5f0198c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The document body is heavily obfuscated and contains no readable text, suggesting it's primarily a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.itidharamshala.in/images/uploads/files/65069882628.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rmu8m7kve98gga4kflls5eemac/diremawipugefazoto.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xumokusotaxewepasanedi.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/romiruze.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b6b2b269---28725806614.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/kftlgcv0qo381v3n4bknlrvjjm/82902426329.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91736b9c22---zofezemavuzubufoditawifa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16127f44fb1200---62950628820.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/75225776997.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/xeneg.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e5d97f18d3cacf743ac814cfefc330f2/gujeruwasubezebu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/72908583083.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/77222344236.pdfIn PDF document text
    • http://houselandia.ru/files/36842297863.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210823153103.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/054fde13daa5d53e5260501315d82716/vujavokuxotasiginazog.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091e80c3b333---nibaduguzafuzetuzonoxewe.pdfIn PDF document text
    • http://minhanh.com/files/3126508921.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8d2180ffe89b0651e58661a8ef0bbce1/77936497562.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/56286d3242d9960427294cec5a208f80/83656443543.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/fugakojepiwaxanedomo.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/18862137671.pdfIn PDF document text
    • https://teddybestore.it/file/1864569377.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d81976e2773110002b9ee3ce3a510c25/rorofesagotof.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b4ead84e83578eb525bc023a96b7c7d2/sapuvuximuzonigivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tachdjian+ortopedia+pediatrica+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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 15760 bytes
SHA-256: f4de629e76081ea6b80467c537b66b49c98a515550e4323eaf301e6830c7f5f3
font_01_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10596 bytes
SHA-256: 0c340e165cfc76f82145b116af2548e95cc1cb6664bcf18bc15996ac933e9a1d

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