Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff8c8874eb72960…

MALICIOUS

PDF

115.6 KB Created: 2021-09-01 01:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba8634c061d72aada302db02a03d45ab SHA-1: 7dbb7bf7fac6832c692bfa4e521e0e2e80dfc203 SHA-256: bff8c8874eb72960d4b830ba6826063fae9ef474419852d0c0928b2f2ea0d8c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary goal appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allamericannursing.com/userfiles/file/84300363862.pdf In PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/88078088375.pdfIn PDF document text
    • https://educhina.mn/editor/files/pifokamerijinesudi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kanememadikebirutu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zedimurivopaser.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/34647904368.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/acd2e48678355be3122a06b0c73921be/fagujufipefalivat.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072828568680---tekugorixatinezidevasaxok.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pqrlt82u3tgnhk1muj050bmblq/42746511610.pdfIn PDF document text
    • http://quranday.org/userfiles/file/33159842371.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b74e02524---nozajalonobuvi.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/temefatanifefipewinili.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a89dqrqvlq90sjiun6k2b4aras/mixobox.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/mokin.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f5e3c185---50892446025.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/blt495qp055suatm11q55cd846/gezodilirodetoveruloreb.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/90855215674.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b42e7be68d9d21f8de3fb2a96090e708/76910190169.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/rudafolubusabi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c176240c---gidurolojobodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=a+farewell+to+sartrePDF 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_off0001599f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B1 21216 bytes
SHA-256: a84a0f6fd76339f7fc4663062f5d1146c008262b3b563d6b908aef49a2016211
font_02_sfnt_off0001a8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DB 10080 bytes
SHA-256: 1eac20c30f9523fbc1e607384d5302e36c5299b6fd9e3c444f026daf8112743b

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