Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc35cf1060483e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 12:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6725c72381555a2c1b7593a1ca533b29 SHA-1: 647b5577ff5c8aed1ab9114450135fe593ad0341 SHA-256: 41dc35cf1060483e94d1ae3c9ca3a4f9ca5cfc6dd80f4ced2ee3f228deaaccec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, and a specific URL with a 'utm_term' parameter suggesting a phishing lure related to Minecraft skins. The presence of a visual download button further supports a deceptive download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=minecraft+education+edition+skins+pack PDF link annotation
    • http://pphu-joanna.pl/fckpliki/file/71570491286.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cacb50e8e---bozixiwojor.pdfIn PDF document text
    • https://arerp.kr/data/file///17200037365.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1lmjjv4ss2ejsbtls6bichr3fc/61909155386.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/jazozazib.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d97a7400---7141731320.pdfIn PDF document text
    • http://houselandia.ru/files/tawamipomawubumebi.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/48350622786.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/697cb1939a524b3bd6ce27e0a1220dd9/67025076350.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/25302119528.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/letanesoriduwakexakinak.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf56614d7ae---52248861380.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93b7a149cd---sawifebemezazuzani.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cb7038c8---gegujafomudegomega.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8a57a462852mc789rigpikqg93/39594281911.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceab04d458---48200529271.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9554719e6f---9869468408.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2600c22a---14807796521.pdfIn PDF document text
    • https://umartravel.com/files/gowekafafurefujamu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3e415c17b0062f98ab74695bc649577d/daxalekire.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/movaz.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sitotipowasanunolu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rigijez.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/69a962c14cd0e41a65ff01d60b943de3/kuluziwirenero.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/20730784840.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10752 bytes
SHA-256: 56f5e661fcb2aa11250caf738e23cf9e689d3be6582024b0298e4a92242e7534
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16572 bytes
SHA-256: 19b0590cd13f93317657f3dbd95a7efc0da3143aa1abcb5f1c4122f1c53bc47f

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