Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bf07f2480fa59b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 01:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a6884d556b1597f387fec48d3f2c7c0 SHA-1: fd83e8f8bee61aa35479ce291a697d66ec8009e5 SHA-256: 76bf07f2480fa59baff87f2735776a47aac431ffee21892052d40a5eb0c38c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous links to potentially compromised websites and the 'utm_term' parameter suggesting a redirector points towards an attempt to funnel users to malicious content. No scripts were extracted, but the PDF structure and embedded links suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://orosweb.hu/ckfinder/userfiles/files/fidoxatemozapimifilunolo.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6a2c567f0af802a5e6884730308b005d/96523437581.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f50c9bce96620dd27d04950c165d29e6/sepefopos.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af695c44a9---nojizajedo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca652653f---fabanovazefun.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/43533655241.pdfIn PDF document text
    • https://artenika.pl/fck/file/16474620785.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9tbq5u5v65un2o7gcn2tbk62e6/62131010220.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/buxejubamexutegu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfbc6d411---wagilanudibimusukizefi.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/12401981665.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0dc3150a---pifoxipizidodexug.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f3548cfb---wimexizeto.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/dumipetomotepib.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/8690381533.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e9ce677a8---78583385986.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/44435157390.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c5a26527cc3493e4fef3f2526a21346a/53362691425.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/30064673736.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b26734adbab---93798788282.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/acedebe293e34f263454806908b5e8c3/towaseneg.pdfIn PDF document text
    • http://davcpundri.com/css/file/1044758615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conversor+gratuito+online+de+pdf+para+dwgPDF 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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 14632 bytes
SHA-256: 58d8e427385b2bd7cee9d4267ca6423126b4d2481acb81644dd03d366aed74db
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10956 bytes
SHA-256: 974108d4796da1db8e26bf819f63123e066a30be69f02d99c0dfa738d662735c
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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