Malicious PDF — malware analysis report

Static analysis result for SHA-256 6361d4c766b460f8…

MALICIOUS

PDF

93.3 KB Created: 2021-07-17 15:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 339b1534d53f92da52872b28ee648357 SHA-1: e71a992c2303c746df38c4540c9dd7d5ce8cd70a SHA-256: 6361d4c766b460f8e2b7ea8689aa5115e1318eb33677ad8b4f11c4ebf866e103
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious content. The presence of a 'download button' heuristic further suggests a lure for users to download a payload. ClamAV detection confirms the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • 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 http://koszyczarek.pl/userfiles/file/ralemakizaserebimobobut.pdf In PDF document text
    • http://etpatatietpatata.com/userfiles/files/sasazivuzojisewe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a4m4f8miuu95gqsj5i88uac03i/gerureduwedonefaroxud.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d50c6fbb619087c45241d9ceafd7f51/34051303381.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a517c95a79c---gofozeti.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1b25205a---wamuvemavudipopufujuta.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/rufejexitapobelofudodibez.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/85616272755.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/mazosalem.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9l09s99qecpo301sifki5137m0/61618704092.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6dd9ed2ee1551c75bbdf8f7a238fce84/jeritogopasolefusapar.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/sekasiverugemanesabazan.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sbo6c8ugq5eopng9e45mtu6uvd/97752905815.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///sebidiv.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e71ab6688---63000599866.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afd07684911---66186611816.pdfIn PDF document text
    • https://irantruck.ir/data/file/fijuwibufovarukedixozati.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af54847dda32f2860b771bbc65c9283a/85758852965.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kugewaz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a0bc9c53a---mererubuvovidadixo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b645dea5b---53185424530.pdfIn PDF document text
    • https://rintrans.com/files/85881621795.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b947b9919---98451914937.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vuzuvakuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apk+rules+of+survivalPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10388 bytes
SHA-256: 798ecb63803968d1bab043cbbd2e688b238a66da766f4e3006ecf1d670d5d409
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 2540 bytes
SHA-256: effba3d7bed09c1e13da393b4cf385e3ec7e676067968dfe9957f8ecc774437e
font_02_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16488 bytes
SHA-256: 79bc68727d861649733c7616a717ed7bc5768b15ac26cfe0f094750d8874218e
font_03_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 25088 bytes
SHA-256: 21ff18538524428b766033872771dcd65692ad879a1950cfd8338029a1d90576

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