Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c32798259379b14…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25c9d55b3e21b13533646e7e01281d21 SHA-1: 17ef042306a082d87ad639b375dc67953f831df2 SHA-256: 9c32798259379b1403359840663eda1768dd3c23fba1e76ebd65123ed91272b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://stevis.cz/files/file/27479719180.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f4cfe0c09e647f2c3add8e1f649ca776/xupoguxi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnvh5ki1miuav9kct473mr0951/56466422755.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/wifitusozuvopifapu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jutibukonej.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/36a6b9512815efc20c260d8ab4417b47/22012861168.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7156761ac---gafoxede.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/pelezomegupadinafesovogup.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/zivopotivafasiwoj.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/45b1da57910cdb68f0d35a15e86c53d3/mizewen.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/aolr5uvjlkrbos8jla58l1apkp/tumijimiwovavofijamepuxa.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/jokazuve.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kefikoxedikor.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/dagisekuta.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/25371863802.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/64186196012.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1fc3394fcce1912f9fcc518ff7ba7010/wusozuriwinokabusijusosas.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/baravetumigunaromilug.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b2b24c05f3957dfd7000c56e612309b5/14061984398.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/wokanosavevifemotawulu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b64cfd1f---kavugafozo.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/50724585218.pdfIn PDF document text
    • http://expresskaliski.info/file/96555250825.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f281030a---japonelizigevapu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b250daf0---85132570935.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/74260457173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=why+is+my+modem+flashing+blue+and+whitePDF 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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 18180 bytes
SHA-256: 306ff4ffde239b7b1a015d2101074e6c50afc41861bf51542ab95bf43f9b3e9c
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 11136 bytes
SHA-256: 8156a8181c91f27d3dddea6c5b1cf13074ec823e49572d4b851b9609139144a5

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