Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71eff3d4c7d02ad…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 08:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 112c607eb54053629fb2316143e1eca7 SHA-1: 5d5693482544c742445144c71bca82523e8b7810 SHA-256: d71eff3d4c7d02adb81beb673470870839566366383e63d3d7184122975aab13
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness. The primary purpose appears to be acting as a link farm, likely to distribute phishing content or malware, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0hba5i3h53c6j7l5j4rm3siaja/50278598209.pdf In PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/somibebosijugiz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3402791b8---nuwofakalisub.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/firutaronanugom.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/65921838396.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/68971197111.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/6844975603.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1610b23b448654---20597123914.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5449a5ec---84814733336.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/jetukif.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/8520355798.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/18983816128.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081251ca16a2---dunamanewuxed.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/vegevuluxolaxalafuvipo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n0jv93v64ef5ek6qpceh5d820q/wamaxutopegeguwijekopimo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/00e21917ece0969ec323b8a475fd311c/sobelijevonapivigosa.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/pixile.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/37731091171.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/jesewavumiratukemofevafix.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/muviz.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/17492083577.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fetopiwivotobolopara.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/30242694576.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/50af1a4b374a52a935d8a4c4dff70348/98937457827.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608251d345099---22896538748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=half+wave+rectifier+with+rl+loadPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10444 bytes
SHA-256: f3087ee839384d9ba5d39c142d2bc0a4c3d689b8c05827dcf585551afda9865e
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 17132 bytes
SHA-256: ea894c16e910604f333897def3908b6551af1043fd61ec42c120925feb5305a7