Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7c45d92ebeb3ee…

MALICIOUS

PDF

78.5 KB Created: 2021-06-19 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 88061126d33dc51595add7b51e9242b0 SHA-1: 03c5ae2b4470e632d8302ce007c5025864700e0d SHA-256: ea7c45d92ebeb3ee56f294a34315dfea8719d4ad053055d0aa59faeb3b02d6dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was heavily obfuscated and truncated, limiting further analysis of the specific lure.

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://airconbank.com/upload/fckeditor/file/pedukajeruxosi.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752ee3b226---nigigutavugavifokexak.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sufodopigokurunega.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zawefoniligefevizivo.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/zimilo.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/bugazanosekoxija.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nulagorepejodebupogipi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9d847f78981864cb7c8663f378ef899b/11481196907.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d3104631438403ffcc6d1732ce354cf5/74159677901.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a136f3acd63---3575023028.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1f7b40d9---97697631622.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa3fc4ac7b8c84ef85693a565d26a11b/giwulepapomajo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/47233660277.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d59b6501981931b4a2cb3fd5b640b1a/fezagorusozeduraxubose.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8839e0e19a2b0077d5a0b722ce1ecbe7/1990240755.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8eeb9f64c61472ef4d6a2a2c35975af3/25011516580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jean+genet+the+maids+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 4992 bytes
SHA-256: 7cab237bc93e945fe97b4eb73a3bf002fd39bf5f736571da0a686f104542aac5
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 11744 bytes
SHA-256: 991aaba1fb64c9b494d93845ccaf96c9724ba0ca9850000b4b2492274133fa2f
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3