Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5992fa290b56bd6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 01:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b811a7ec064238b9bfd2bdc9f7cf2a8c SHA-1: 2a52689c0c69668845084c3c6d14711209b66189 SHA-256: e5992fa290b56bd6838e71579efcc20f0c143c5a403d824ff58a3be97ec8e5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or link-farming campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://barrybusiness-crm.com/ressource/devis-photo/files/86330346030.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bb4ac7053---55488391630.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f8c95e40---fulidez.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff91769081---65012155578.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/vepepuzibosikovawitogub.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/susefugefalomikasozimibat.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/wasenifiwiva.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7e9881d77---wagiliju.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/83239264341.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/80998602096.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/wijan.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4be9b296c9---sijemin.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zevam.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ujggls92kf1vv4kgme1j9cus63/roloxuruxexonizo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e0cae6d2b516074fb5f8189876f0a922/wogepegepafitoraj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607201b8dc94d---bolorifetatiw.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835a7c72489---rinor.pdfIn PDF document text
    • http://oodow.cn/upload/file/210718074337586104lmszpda0j64g.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c0822a5006f5ec4b2c9f5329cc82d44d/97228597922.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e047132c---zopimijixikawavifisufanuv.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/welegufukano.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/47944796153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+waste+of+timePDF 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 17100 bytes
SHA-256: 9c447db46c3384bac3adb5ae6869504eea5d440feaa52963f8a2ff9d883d43e0
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10276 bytes
SHA-256: e41fc5563630586b2ed84cce6b694d66fd927f0f8d99bfa73957ab1f7eab4da5

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