Malicious PDF — malware analysis report

Static analysis result for SHA-256 445ed4d8de5ad641…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 414d30f1040c2f589a2c5aa80193388e SHA-1: a7ce2e9250e86c21ce7598ebf3e499f7200f21f9 SHA-256: 445ed4d8de5ad64134b524f7c7737a7c598de57db822e1a49b18c4a5c7ae1f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

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 https://oniceh.ru/uplcv?utm_term=hugh+jackman+before+and+after+wolverine PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c66e4cf37233d6a545998f7df1257fb4/figagopekewoparebisepunu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8cf71c6a---80502306031.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c1b591cf---jaxomuvijina.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/2714722959.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2oph7d9it66v3qkq70l8befp4d/59055699094.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2af68d9de---vujizesopiwebid.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f870b995---10546351388.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/gezuromamub.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607952e898b38---xetewoniruzemomuxoro.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56711d838---30743116082.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b2e501e8b6ea706d5ea2fe6829c17141/91486824394.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/96506981675.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/nopolalapapevenawagawufe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b9num3otfb094pukn9afamed06/moperojesuper.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/52700415436.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8ddb7fa5aeecdd2bc00b8564e7427838/24392451496.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/21987865274.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/j4vc425oi1o24oqg75g0qn3dnt/43259912799.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/sujotafepudizitejitomod.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/6603383435.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088952721152---xapujolemeba.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210608033355.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/88113880705.pdfIn PDF document text
    • http://nktrading.qa/file/files/98645541802.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/ligadi.pdfIn PDF document text
    • 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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 11360 bytes
SHA-256: cf3bf2dc4c9657bde66796d8d60baf1d6e59521cf3cf0748ceaec4e38428b8d6
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 17664 bytes
SHA-256: f2ae6dce7ff905af8296e3581192846e7a9a9eb03064855fdea53d878aec7617
font_02_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1