Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adb53faee1bea44…

MALICIOUS

PDF

88.4 KB Created: 2021-09-23 20:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c251560f299d74028c0b46d16f9d97a SHA-1: c528b687fb270af3f9c22feb72f5ae8b7d9e31d5 SHA-256: 3adb53faee1bea449c4aa7061e23c6351bf790d42bc6003e5d37ae00443c4160
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It presents a fake CAPTCHA or human verification prompt, a common lure to trick users into executing malicious content or downloading further payloads. The document also contains numerous links to external sites, some of which point to compromised CMS upload directories, suggesting a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://hkxhjfc.ltd/uploads/files/20210911153721.pdf In PDF document text
    • http://teresachild.com/upload/files/9881317506.pdfIn PDF document text
    • http://tiquital.com/documentos/file/zamivukovovofijulavovepu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pirox.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/samerogumev.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/siporugaxazem.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/gugubipapewefurebum.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a0af474ea---5404246353.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485bf52133a---lugeratijep.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/97847796315.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/munomofifafilagovuporuro.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vibotig.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/pipafoperiduwe.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/zoxafupufufo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/21127140202.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pedunakimoxu.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/50281657546.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/43652937655.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/penikeza.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/96f7a5fc05b45adbd7d9da75d002a2ae/53045320758.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/53824735614.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145e85d8ec6e---46362860007.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/41494441656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+5+download+without+verificationPDF 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_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10828 bytes
SHA-256: b7352f3b6cfb34a59bb8ef1a22538811ed6c72ee424ecde874d29deed7e0d1ec
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 17512 bytes
SHA-256: 6b85563a205823669d6e0a8c841b960fe57b9b32a14e58898cb71d8fa48675cb

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