Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a65e7530beae58…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 22:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a4f223e3c142439de9ffa2c70273938 SHA-1: 35356b4f10e4b9b03acc9a02ac5d88e1a6474c88 SHA-256: 92a65e7530beae58988e9607209536351f2a31261d5a5277714312dfcd26bd98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic, presenting itself as an image-only document to conceal clickable links. Heuristics indicate it's a link farm hosted on compromised CMS platforms, suggesting a distribution point for malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware delivery vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/538e75e3de269ee552d04c6352050a80/lojiw.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d3933abec174d947c6058e274f55e21d/87642384903.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/paxekajir.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/11881878664.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/54468173932.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mevogefaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338179d2ad---95280411621.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93bb62ddb---kulitelireji.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0905317001627885251.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/14851572431.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47d67142e---lesiku.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a6e201820640d3fdc38ec902b484586/40121463562.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04a444be5---delenerapufim.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/lefotubokimokokewudisufa.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/14613780320.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/fivajuximitevekonezurigi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ef30vgndi8djbj7mj3pl6sfi68/dolazesulo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee7d90886---somememufimodikoxanit.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/5180210345.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608736e1590b9---53833313380.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9faeafda---mexozinusabe.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/92658278940.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d219cd84672ad1efcb2b56f189199ad0/zezamo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612d6bd1f22ff---ritiwereriwolutaxoxakif.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fagixabufodizami.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adaea64e2e0---rumadimixomifuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manualidades+sencillas+halloween+ni%C3%B1osPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/42068251250.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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 14336 bytes
SHA-256: b990e462d0eff21c303f549967dd73601dd349cf0b2e29e8a2d4caca15ee6e8b
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 10656 bytes
SHA-256: 1d19841556887d92f2350bc0320eeaaf0f224c31499f6424d2edca38f80b9f5f
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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