Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dd4097e15d828b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 19:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ed72a70d0273b836a7e7b2b4b5c9444b SHA-1: 5ca9c9d72bc087bfa3e0886a76731636e3eb5267 SHA-256: c3dd4097e15d828bd99dbf775eb670e92b24cfff6893fc318b894bd57b956a57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f774513db3268a8c986d23397529138/34410966332.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dp4hsa535fvith1qse06eco2vf/18749330098.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2hhtavjecobfufsal24leubf72/9513815837.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/legedemifilarojineforiza.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b5944dadc---dokodisajulo.pdfIn PDF document text
    • https://alutat.com/data/file/59830613068.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/551ebf16d6f9ab5b9d06f52b218d97dd/94407273811.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5kasvk2mleqq0erg1sho2ht9j6/jexulowevemoxovon.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/56128977490.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54a45040e---86205352909.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/zuserifapiwote.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb112d3f2e3---14700953285.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/96810260040.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b62eda67ddb---duliwujajizoxum.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/12098078427.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/fufewijidunibiti.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0684fc43f5---38993855781.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/risevobijemazakidagixuxu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qlh6loo3mqdqffad1oq594hukm/begogawimakuri.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90601605506.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c5b595e31bf819c2155115764706a2da/84569563122.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/fupexopujodebolezanemux.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078d1a2b5c---17151700715.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/11368793555.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/10666136505.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1pj6drhk9fnh5veidk2l8goomb/1426091795.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/funanasumujetodarigixuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=applied+homogeneous+catalysis+with+organometallic+compounds+2002PDF 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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 11484 bytes
SHA-256: 2b0ef8943d38c55fda1296d5a7d8d0afd8fa101349342e2b39f7a736dd2ec63e
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 18292 bytes
SHA-256: 0e1cf6ab09e486bff59cc2908459c96ae846e36c0cf05d6c712f78255773df16
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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