Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38b95dad58ecb47…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 03:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b0ba1f03e98918867456133267b9f33 SHA-1: 0e1bf3284f0a9c7ea48ee522e09a008325dde523 SHA-256: a38b95dad58ecb47c7d24eb0bc17f80eea1a7735fb0d096c79081b50cb021015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, specifically targeting their file upload directories. This pattern is indicative of a link farm used to host and distribute malicious files, likely disguised as legitimate documents or software updates. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b5d6e00b62c8ea029b21c97f6c6fac1e/17271387327.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/33722393060.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/lugumixe.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a97a0f85---77579671536.pdfIn PDF document text
    • http://gojjang.com/uploads/files/88098889714.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/xufejomolowowexatagonimux.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zopiradademezexunokufigov.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161441b2f056f5---titobulowatelekuneni.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8205d46c---32986999535.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/48039179387.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wipoleragezanefoxopubasel.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/48846488199.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/datifoxoledet.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kewoxerubakalefuguv.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34099455148.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/36157710113.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149c804cbc33---nadavivojuzatazug.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/5930079590.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/jenaromituwejizixovejugu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/vawekaveruz.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/16062107710.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/fulobetelazuvon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330386eb55c---tavekenimipirem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=linkedin+apk+latest+versionPDF 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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 17204 bytes
SHA-256: 26c6445793ed7f2656e846de2a6bf91301044b3d70bcd06ff9a247362a03b916
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10500 bytes
SHA-256: 8a52fcbfe4f4c321c460e02284f7e3837430aa64a022b083aa8569919053459b

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