Malicious PDF — malware analysis report

Static analysis result for SHA-256 385e0573a9b85b9d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 23:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2223ea8cde7ff7288e28ad45021bdd5 SHA-1: b4b174f2817d50da9f98e699d7bc379c977d83d6 SHA-256: 385e0573a9b85b9d8fd555bb574b7a9cae6bb9d57748e784f4658d7e33e68b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1608efa9b6b3d94b2470fd38623876b5/zonabokobukox.pdf In PDF document text
    • http://antifftech.com/uploadfile/file///2021090204584157.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134214f665c0---duxalefosatabetuwifibixof.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612efa2d221c6.pdfIn PDF document text
    • http://retailcop.ca/files/fosuxidul.pdfIn PDF document text
    • http://ilkemymm.com/image/files/latajuvurigulukesaweweb.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905110333370729.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/87826231358.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/74215762438.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/jowumupebogusedu.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jupudabafus.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210910230346.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd025628---tobufofisofi.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/67343154249.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/5286942490.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903090508.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lowojakibudajusasugiwexa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l8v7qll92ucrk9iqm5vl22ksuj/41639203210.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210906235446.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/89251589633.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sepedi+bible+pdf+downloadPDF 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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 10428 bytes
SHA-256: 44d3f123a9f3de92f56b0d0e9c5905a7f96b1343661dad1293fb3e5dec80fc4a
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 17224 bytes
SHA-256: 7dad0d5730cdf0e21efb85cf0b19e0488e66c888475a8136e436ffe659561c68