Malicious PDF — malware analysis report

Static analysis result for SHA-256 407707dd40f2dfa4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 08:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f21de016de517231f796ac0124a47968 SHA-1: a58866363fe70d8ac9d4dc66fcc3b884b848d647 SHA-256: 407707dd40f2dfa473a62d8a99ee9e329a189f16f31ee5b0c434e86c62b81005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing lure or a downloader for further payloads. No scripts were extracted, but the heuristic findings point to a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=tata+mutual+fund+kyc+form+pdf PDF link annotation
    • http://sns-russia.ru/userfiles/file/wiwevukosakiwarog.pdfIn PDF document text
    • http://prosquash.by/data/dozegilibigede.pdfIn PDF document text
    • http://charivne.info/images/file/88313978339.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/59571527147.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/br62uf81cjfbih8a3nqla0c77f/28557689608.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/29985801080.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/68fc58592f50e28d502ed08db40b88e5/posogib.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/44459964497.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e41a2a70f390b7f994811e083abf1dd3/xekevevenuponus.pdfIn PDF document text
    • http://myqself.com/upload/files/1981350043.pdfIn PDF document text
    • https://invest.pl/userfiles/file/94415313795.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607258cfa656e---13813191530.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/86c4e6c684c683b685483a3f748e634b/zexadafol.pdfIn PDF document text
    • http://gibisch.org/files/files/71371792243.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/zisotu.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/zilalefodidujiko.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09530931cf---kusozisamikixokipidu.pdfIn PDF document text
    • http://cutskytools.com/d/files/fuzomokubenomuji.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2fa591e50d7b93aea09b4aea2bc16307/fogapar.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lebusazakatimu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37f5050620---lelorudanewut.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/83075421895.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df6e668b5---40724565757.pdfIn PDF document text
    • 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 10656 bytes
SHA-256: e0c24497c2cac082fba146eae851a9ac238eb8445607c9a901623165595d7158
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 18316 bytes
SHA-256: f416004095d78234d4cf177c42cdc339b2833ebf71f68adbb435e1188e9732ae
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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