Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdae88fba78282c6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 12:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 388691173732a36cf651d18da2c0dfdd SHA-1: bd45cc3738ed5dbfd24bee1dc3b6a0e07779475b SHA-256: fdae88fba78282c6c8f353825be394f9180004957b176234f6c574bb312196ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=thug+life+game+download+for+android PDF link annotation
    • http://211.129.1.225/system/ckfinder/userfiles/files/sijidivafilari.pdfPDF link annotation
    • http://halanmilk.com/upload/files/zoxobafebejuru.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/16651832875.pdfIn PDF document text
    • http://ruihuitax.com/files/file/61856677348.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pujukolutiro.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/56598542896.pdfIn PDF document text
    • http://dgkno.cn/upload/silemipinurufutozuw.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/99738440218.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_6056_974.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/wuwawopanuri.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/gaxulejivegepifenumilem.pdfIn PDF document text
    • https://titishop.co/upload/files/95033920671.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6a174ab5f0ab7ed9c261df6d36352a4/ropisuvof.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/96359004224.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eebdf02b7---1569979727.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jowonewifaliji.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/denavolaxugikari.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671aa42476---34539395091.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nuromepitoturutez.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f16b7c430---58322779590.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/34915387244.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/9385333749.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wobumuzezoxusukeditekew.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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 17392 bytes
SHA-256: ebb4c2613ddd6eb1b1a2cc6ef5e7d62de0a537a2d15ab94e851a454bc0c13f6e
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10684 bytes
SHA-256: a98787a48786f7edca003966b689cf081fdb9281df0e56961cc2231c6bec26ce
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1