Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a261175d7d3a7ca…

MALICIOUS

PDF

99.1 KB Created: 2021-06-26 23:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10237617569691e5e71c5aa2d12c3731 SHA-1: 72375ec5cbe1a34d699ea6faaa2370feaea6ea2b SHA-256: 5a261175d7d3a7ca130ce8091cf185acdfffc296967c15051ae2c78902b18779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 6

  • 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.
  • 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=courgettes+in+tagalog PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/209d2f9a9f6df9e83cb17769ad96a9de/27943638766.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a46374249---74894037335.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf8d7b7b7---kegusaburagufeto.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d851b7136a7951dce3dfa33df3cbed11/32169046486.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/352632a881d22273664c155d6e846be6/98876913525.pdfIn PDF document text
    • http://ubest.ru/images/file/19992061024.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/49001641639.pdfIn PDF document text
    • http://terminsk.by/pics/files/belesasenavasepe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5110c3f74---zelupotubeviv.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/35271671102.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ckkf991fshmmraq60m8nr7g6gt/72217505180.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/57216149008.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e020ee---23284479584.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa51e3f8d---93647048267.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/41f3la2kedcneupvj2k1837vsg/basoroperederaw.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e831db816---wizalinotidej.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11340fa723f06c8903995291b5a9a3ff/12719689357.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16213062808145.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/22275255305.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/vugesuj.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/604b50f62b5871db5889eddbe6959159/36358075665.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701c248b039---74308188607.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbe2cce10---87753390097.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001053a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1053A 29388 bytes
SHA-256: 440b31b2d24c2509b0c0b7f5213cb883ee1ea211008a256ef3c86b054ea0e796
font_00_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10416 bytes
SHA-256: bafa9d0d683a4a10e4d77c2e022b39b9b7fcfcab121422f56f7b63b1625fb5a5
font_02_sfnt_off00013a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 17112 bytes
SHA-256: 20bfd1a3e4c9302361badee6de2c47bbfed731cc6177e3750c3ce83cf71a1a4f
font_03_sfnt_off000166ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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