Malicious PDF — malware analysis report

Static analysis result for SHA-256 f650e08fae7793dc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 14:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 560d4b0f4ca126a279306829bb481fab SHA-1: 16efc54f652206f39d733fe853902daa1e19fe1c SHA-256: f650e08fae7793dc70bb94f748490df26decf1fa57f969f7a066ba4a18c34eab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://synerhu.ru/uplcv?utm_term=secondary+school+science+textbook+pdf' suggest a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://synerhu.ru/uplcv?utm_term=secondary+school+science+textbook+pdf PDF link annotation
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93167939014.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/boxuxuvexuvenudotoladugok.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/34293920235.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/fodopef.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95581becaeb93ff0010c790167d069ab/jilid.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/31459655922.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/rokixow.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/dexaseratim.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/87424692721.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/pakaberazirokafepoporese.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n5t2gd9sb31fhst9sr0fedb1jl/miwufidonekejukag.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/salagexopiwekupelirin.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/32491964401.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6f08e9e87b60a1be5fe5d4590ad99db3/32340218819.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/12326822627.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5073f078db59365618373854026dbacb/97127803022.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/55744490231.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7926d7f3bc---12534280784.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/85b199ec2b2757f91f9b2d5eaa39e5ee/13676479584.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vujewisojoburewekaxinujo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97e1d58f7a---92264350449.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4dtnlb342bna3ij687vh0677j7/gopalewoke.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161213b6a10933---25423645747.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u1lhlv6in0h6je9b6nqermg4uf/gonukulikajuxuxodefeguvu.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/88510389864.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_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 11240 bytes
SHA-256: f6b986399ba980b732de212695826e3d140b1bfa40e7456edb3f901fc5b37227
font_02_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17428 bytes
SHA-256: 0f5130a1eab9a087a24045665f809f6bfd0dce7c821a054a6cfa7ae3bcb0e60e

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