Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c75477b81c1f0ab…

MALICIOUS

PDF

98.8 KB Created: 2021-06-15 11:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c6d66ccfef2432049809ae76c4b7611 SHA-1: 2dc3dcfc51fcddfb75af68233a5c2da69985886f SHA-256: 6c75477b81c1f0ab222a95186b4fc6254e99bd87fe6944f524b4d53b51451c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm heuristics suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=happy+birthday+to+you+indir PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7974b4ee50---terus.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/19p855e03ta9katdin5gbaq7jjh8gmlj/jogadewavabasute.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1a057560---jelowizanelis.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/rigakulizuruzupokowesiw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5540ef98---jowelaje.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099ebc377c98---nekazexugejasinogulagase.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/158c5dff11e4a57828b63797bb95b057/witirezogopelepaxexeme.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/554c81eea1b4d60c7181165ef85eaec8/jowawurib.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/kemafajekosekedusinuwazu.pdfIn PDF document text
    • http://getem.plfiles/file/19651237894.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3d467913ddbf13e8a23f541a31d8645a/18011111514.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/34456064548.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a985ea8e087---zutisemopo.pdfIn PDF document text
    • http://saptpadi.com/files/file/kezuzimosu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7f356524f1c32c35844190c981d5a25c/8293168467.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa370e2be2---mopimezudex.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e2093296---3027699790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 3364 bytes
SHA-256: 6a0dd199cd4a36a31b3e668ae7c773f541e1bff28bd1a8102b5dcc3ccecec025
font_01_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 4804 bytes
SHA-256: 91e12aa273055e0e3c055578f5c588f7d3306debea3fd007517bb5daff2c31c6
font_02_sfnt_off0001447c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447C 13372 bytes
SHA-256: 15745ccd93d38a86f5390c08ba2fc84779348ad62f283dfd9228a378bdd7f320
font_03_sfnt_off00016f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F64 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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