Malicious PDF — malware analysis report

Static analysis result for SHA-256 a158b6287047b342…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 23:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 375c64db3d6fe54bcb7e677bff5f2e87 SHA-1: 5bac5baa368395167c9db8467e4ff4ae4630aaa8 SHA-256: a158b6287047b342c1f9e68e63f3a57ad588339e9a9f832a937d4ec7a12f1e79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=skam+france+season+3+ep+1+eng+sub PDF link annotation
    • http://zatoodesign.com/userfiles/files/pazojuxemavixegowotan.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/51108001144.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/17797039293.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8f15984a---wiwerikifon.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/tapejubutojol.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e9f7524a---metefinisizunavuvozoleji.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/bajapinixone.pdfIn PDF document text
    • http://medrea.ru/upload/files/78802032086.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/60553882490.pdfIn PDF document text
    • http://hybsch.it/upload/file/raguxunokimi.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/94543786201.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109141915549799.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/42472284450.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/wonubezoz.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aaae64cb9---nonekap.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/88874170904.pdfIn PDF document text
    • http://ud2-140.com/files/49875792416.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/xodawimilefujije.pdfIn PDF document text
    • http://nktrading.qa/file/files/42555838893.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pikanalola.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399570dcbf6---38357265431.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f484449117---60962074135.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918237427356.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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 11216 bytes
SHA-256: d9acc70ea78de9f447e87913742e7e2be35f3d2a17356f641c8f6aeddcde79d9
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 18892 bytes
SHA-256: d102034fdcda133ebf29af623474da4191140aba5829739b2047e66703c0060e

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