Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0476628cfe0d61…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18aca393b720409167be895bd42beb80 SHA-1: 11cd7034a355fb0954bb58ed445f9c1e337ef611 SHA-256: 4c0476628cfe0d61d38df4f3f451937294893dd0c401446b86c2329368b90c15
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f0f68fd05fea945f2cff5dff4a7d45e9/78314643630.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f8e5fa2a---72704143309.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kppkjrn3o9rvegjqpmqh35u581/novanosilupaveluwovi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beda3ede03---konov.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fujowe.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fdfe631fd4b4f295a9bdec126b159dd5/80871672789.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/45130053914.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/41a3af35e5d44db427c4cabfa153fe38/zoxatajutabefumeg.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db6184690---30608041943.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210619_41BE3831E2050C68.pdfIn PDF document text
    • https://hgb.se/filer/file/gozavazekubuwedaxefemofe.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/14367090453.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210721071748114.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2d20585d5---82152382152.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/15f9a7e0415cdae021e818b604fbc5c7/panodozeferisojugajetetil.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/ribujerisejozovegixopokud.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xilaxibusekif.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6777487de0---92142740894.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2a307431a812d88528818d30e55ccebb/90033517354.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55b2a21cc3c174d0e122fcee60111f09/5984452284.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/78117175415.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/muzujeditosesaxumafevamul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=make+picture+into+pdf+appPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 18092 bytes
SHA-256: 7e7571d818caa52e53ee74f8b67f9fedfd9fe8c71d35e04f53574f070fb90240
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 10584 bytes
SHA-256: 772efee534af2f7716feeb4489f429dba85c69980f4fb909d4d54960ce966e0f

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