Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6fe88d33c92b91…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 22:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93424101ff4efb1fa8e0509321130e8c SHA-1: eff981f8ffd0038308deef731600a8dcd1b8a1eb SHA-256: ca6fe88d33c92b91ba273f129b2f40bcf742e2ef3bdf761b5ed63e87581e99fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=statistics+book+pdf+class+11 PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be3877cd20b---buluwesejemadekod.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/palovedogomigaraxakutorop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb01085773---jowakize.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bc12f1dfe2081aa7fe704e7222607f93/67491776059.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/wizez.pdfIn PDF document text
    • https://bem-sa.com/img/file/sisizewonodazesafid.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d33f3cffc38c733282b7058c5d721690/zasir.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/52024557013.pdfIn PDF document text
    • http://tion.hu/upload/file/vamalal.pdfIn PDF document text
    • http://garderoba.sk/images/_file/62309910797.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fupiwagasaroj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a1e3ef5a---loruxekolikuwi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/91286984378.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210610_BB1FA2FD5F72C052.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/nowiguwafudojafog.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c4543a0---71073508627.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/9qogs7t8g9p41afe6g28lk17o6/18374898041.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/tizanevefinab.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c6pnughi0o0ukkemafn2p786t6/5553519921.pdfIn PDF document text
    • http://piecco.eu/upload/files/37445557561.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/luzipebojimexogefasax.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tsbn8ncurij73fjd0ho8hhepvs/54998368077.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/nurigozimilasomiteluzalir.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_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 18240 bytes
SHA-256: b03748024d9ccbdef298dd74fca31353fe4e1535200118de88107cadeb723dea
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 10636 bytes
SHA-256: a29f9946a881f5a0bcc3c23f3cc49bed380fb4273f81f6da8d31a7d831e0bf59

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