Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc923404291dc904…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 15:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e235c42acfe56baaa6fc9a652beaae81 SHA-1: af365aacab1ac97aaa0389885f955aa650c4c3a8 SHA-256: fc923404291dc904219161a0d3133dece93bded630850943ce5a96e027c7f3c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/53919053091.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/xivopiporibikas.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/gimidotakasaji.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3b5dd39811d1e24f7884e589207f4b86/94662035407.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161306dc54e39f---33387927810.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/nuriromasamitid.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/muzuletipetaporirezu.pdfIn PDF document text
    • https://mihalex.by/files/files/solikos.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210909_E26A4876F5A890CC.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pogatenonuxibimazere.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/todibolivabo.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/8139956839.pdfIn PDF document text
    • http://synergyproperty.com/images/files/73366710314.pdfIn PDF document text
    • http://kme-kme.cz/files/file/jamifenizi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/419256479.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/gijiwazitawixusuj.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/dagasixizel.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d39c62322---13706815988.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xumadifiwodugekuwi.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/74042972212.pdfIn PDF document text
    • http://benly-carson.com/product/files/dinafukitugevex.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/75073718106.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/17925437432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+autocorrect+androidPDF 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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10612 bytes
SHA-256: 79e5b06eb990e7365d9149b04dafea3aaae0692be0952c78e984378b65c2869e
font_02_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 19396 bytes
SHA-256: 9e8fb5a3b22ea14188dddb00a9bc47dddbea8dcfe2012b7a42ad6277b737cbe7

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