Malicious PDF — malware analysis report

Static analysis result for SHA-256 6673f8fb3fb8cd11…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4be07eb2eb80cf1b3254a09de315d090 SHA-1: 69158547b677e75c709a020709d752f786f582d6 SHA-256: 6673f8fb3fb8cd110e1f3822adb44a620ca3d5ff9573af847714485468ab8a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

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://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c722cbcc0e0155a3bce76381589f8e91/ximuwavonutokek.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/43841680328.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/40585809528.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/43236034231.pdfIn PDF document text
    • http://amdind.com/userfiles/file/91360884558.pdfIn PDF document text
    • http://freeski.hu/freeski/file/bozitapejumulitakotigeb.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/jalumisolip.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/86077908204.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/kurezo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/86f5649b51c5107f25c58f87b3fef70f/vuxalozutepumazetiv.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/94364358085.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/84990189884.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b799d245cd8---61314356806.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/bogumofax.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098669e941d4---sudapabukozev.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/69962187205.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670adbcd6b---79884723411.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/29741768482.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/87713445136.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/matafobokojewuxujaj.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/73520653255.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/xofubexazolomupapegunu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/278deb991941f17095d73e23e1daddd6/23226373836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=world+geography+pretest+pdfPDF 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_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 17436 bytes
SHA-256: 5426e88da83e59e4315ea286522ac2c7c4778543fbb71ae58a2dfe6b3ab82660
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 10688 bytes
SHA-256: b1b843b4600383314199f80ea691337874b6b93a1ee06f015b43decf99b9bae3

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