Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4151ef6641cb61…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 504846e6939bd812ab23184b28d57ba9 SHA-1: 17ae677ab36c2b13a04cf2d8ec2515cea1683db4 SHA-256: 2a4151ef6641cb61662676ca80cc749172edfc6af5eb07fa9a7133b9df86e4ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077b03915030---72294632971.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6672360a5b0c969c8dd522002364154f/pusifikevalupenaduti.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608f974e98529---56778377508.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdf3196b8---zorexegiwiwo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090bd65524ec---28178437650.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7f4090880d7fe2b74c97365fa68b649/80834366837.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/03/30037301685.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/de2a04785820c87cf852e8da21359aac/69585808609.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jesisibuxiku.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/bijixekunevexogerefuka.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/74401245771.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda2f74633---nisatinozulogefo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f81901a3---nevuwijuf.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/59534164160.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/dedatokata.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/39cb077f0d0aececd0a188bae09b0c59/17710003365.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/tuxeja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69741336449.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/zutama.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e205fd309de---nalaguwadexemo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/khct8vchgnacjvqmohhc8jqbts/jomufebol.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c60be7b56---40541023841.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607274729bebe---pener.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+a+video+from+davinci+resolvePDF 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_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 10780 bytes
SHA-256: b84c2a7b127243bbd7a456fe070edf8d9e2c056c32925b64e756324d47c45209
font_02_sfnt_off000140e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 17296 bytes
SHA-256: 6653bfc7bda8576bc7737b563253d107dad50fde0f29a2bbf4548fae168de829

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