Malicious PDF — malware analysis report

Static analysis result for SHA-256 1415855f67a428b9…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 10:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b5490a3c50eaba22765ceabd6b33e3b SHA-1: 9f7cc3848c12e045dc1f201e180a818805727901 SHA-256: 1415855f67a428b9e78fbe17f54229a750dab296d698d91943e55271a6823d2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://land89.com/ckupload/files/42750578220.pdf In PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/sutusuwa.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/beguzominebilerawew.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b024e6318c0348332af2f2f92597b621/xixebide.pdfIn PDF document text
    • https://europartner2.pl/uploads/karafa.pdfIn PDF document text
    • http://haki.vn/uploads/files/2555977028.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611097c061847---75809043589.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/semop.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/55869030860.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/87497679917.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4086a5a32c5736909c5c3a163f8581c4/93652065069.pdfIn PDF document text
    • https://hinaweb.com/upload/file/diwilesida.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210627212137.pdfIn PDF document text
    • http://learningkey.org/userfiles/lezawiwex.pdfIn PDF document text
    • http://getem.plfiles/file/43427460902.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8abe8c9242004dcaeea482231a1c5347/wemagetujuzuwipiseso.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071996dc02ad---segemekedezu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/tirudopomibokej.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa986208ccd5100089eeef8ee5271e48/zilariwikere.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///difekukadojafabumi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/45862826408.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dirubetuxunekamomewifor.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/43822263471.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kigijakijarofojotadonuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=who+is+max+luxPDF 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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 17360 bytes
SHA-256: 5ea56c661f7818df547b010b32b3ea62050d86595dd901f00396d02b9e844b18
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 10136 bytes
SHA-256: 57b8ca7b371e679a07a4d86fb01365a0e54cd5eba2b5f89fc76b6a913391e6ee

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