Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d062702451355e…

MALICIOUS

PDF

89.0 KB Created: 2021-07-22 19:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74cbe5359daab5a62c00a5c079442917 SHA-1: 7f08430ee347cf35a4ff46ac487ce130e41c3e18 SHA-256: 08d062702451355e7b5970864f9497829c85fb6881830651438fa5d15edf0fd2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous links to compromised WordPress sites and other domains, suggesting it functions as a link farm. The document body is heavily obfuscated and unreadable, but the presence of multiple compromised CMS upload links indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/85ab5fe03f8df576d20e2d2a26575030/tenijabawuzoniramofa.pdf In PDF document text
    • https://jhservice.net/imagenes/galeria/files/fuvenepusubatujunijumoto.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/milawanive.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37261b1c86---vonotufiv.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/8974351801.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/qn9hmi64cs6en2t9a4q03a4rg5/wazudow.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/wizitisaduraf.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ea153d219e6a2ffb3c19d4dec3d1063e/76490597815.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61465daf3c---vumatamunebidatuzawib.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e13366ca---41073265909.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/14217635104.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66a8d8b8e---28467801446.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/jigijobotuweros.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9d74d86acd738092284d29597e25216f/93149972230.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/lezewelizakotogenamijit.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/topadeveje.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lni1sq3lrr7hcmc3uk4itbrhqk/tunefovelawena.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66df02bb6---xizin.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c69f09f2---87979211759.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/61e43402ebb4cee7481f19aaa63bf5bf/16310678683.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/venajikabof.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/buvikupipidegedoxuwuketu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/70714976049.pdfIn PDF document text
    • https://lasanisports.com/files/jemadozogusoper.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/89414319154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=skin+steroid+injectionPDF 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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16760 bytes
SHA-256: 545aac3950ebe26dcc1796950487ce82533834588a98bc194ec82a08fb706876
font_01_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10452 bytes
SHA-256: 367ab76efd72112461b6f8f94e897b10a545264f58e43670d6686e8fa6cc08f4
font_02_sfnt_off00013d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1