Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c063224189058c5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 23:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c418b1c312274aa07febaf5297eaa9cb SHA-1: 9eceb0a1eba9f3360b51365ee6eccbfbec26aa38 SHA-256: 5c063224189058c564fbd665a471c1226891108ee90fc39250ae1b0a721aff91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ahha.az/userfiles/file/53338234370.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/30997612063.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/49734913604.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd5063cab1871f3dc960caf217b33be9/lufazolotoleladutuwop.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/kajisuzelugujagubida.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zenifanu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/75128413748.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/korifix.pdfIn PDF document text
    • http://seamacros.com/upload/file/72468307586.pdfIn macro / runtime command snippet
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/doretexowizoratagix.pdfIn macro / runtime command snippet
    • https://alstar.uz/images/shared/file/74069944986.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b8561b79---lobelegodomakagigovitazo.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/magumixezugobapipadi.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/4993713887.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/4386840331.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/59844547262.pdfIn PDF document text
    • https://energooptima.hu/upload/File/disolirunovig.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ba4975c---gukokepirugedemu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/midorobino.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gizozab.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/mumipisafesigavopene.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/fisula.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/61201374848.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/63197091199.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/torutoxamilu.pdfIn PDF document text
    • https://fundacjaartfreeIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=app+trailers+apk+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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 16412 bytes
SHA-256: 6da0ce9072d516207b06bed61c4af224bb7a3c4ff00615c4441000b3fedb9d85
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10544 bytes
SHA-256: 2f4e49e5f5bd8dc5cbff2681ee5f00cf9e13d4d58119a2e56dc9e4a3310b2b39
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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