Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c008c15c479b63…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 04:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95cfe404506cf1e770ab132b611cc6e5 SHA-1: c344799fee3004feabac732e061c9f412eaa6ba5 SHA-256: f8c008c15c479b63fc31af9dd57b3aafc8a9ec2fe6d166f892802d7d3f303372
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://extrastyle.ee/ckfinder/userfiles/files/vodaramulijujazubem.pdf In PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/nagoserafetukomi.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/49679227044.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jozopilasejiriziv.pdfIn PDF document text
    • http://pmke.cz/pictures/files/36906452690.pdfIn PDF document text
    • https://le27.fr/docs/file/41866992063.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139b51951fd8---sotuluboxamawariku.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/46317087326.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jaratologadolav.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/16801870954.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/74382927715.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/70463490368.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/losuwofotazutepel.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zutogujitu.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/93953405103.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jumufopujorikawomi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6aad362daced46e957a449b0eb5c7cb/47359922165.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7120358d---20758823263.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/77691707185.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0682b818f795b26a14e413d2f069be93/43475273416.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98350998131.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b05f073f9---48020739811.pdfIn PDF document text
    • http://finchamauto.com/pics/94821543474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=student+portal+office+365PDF 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_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 16820 bytes
SHA-256: 4bee0ded059974dabe3425da119d643018a1a2e236d1359daaecf9ae39cb9b72
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11092 bytes
SHA-256: 9a38c23c625e17b4863c29d3cd9c6fbfb73473f98918d7f07739342de688c05a

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