Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74cb06d9531dbef…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 17:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe48dfdef6762903ff3d112b9f4cd829 SHA-1: 457fffdeb959598b56e434c2c9b93b45bd946bcd SHA-256: b74cb06d9531dbeffe71a4f2a6dcdabc0986d3e95981065de5b7f2a556cdccad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=how+to+change+app+storage+from+internal+to+external PDF link annotation
    • https://masukpt2.com/contents/files/sifiropagilaw.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/98452908566.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/voposudewutiwubuxe.pdfIn PDF document text
    • https://kawanmto.org/contents/files/72147078370.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/dinuterimediwalozi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/58c50b80f787666ee5911ea605b95e5a/9114970556.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/veximo.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/jabilopulidozodudoleka.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/pafokuxaxelalokofudasan.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/rigudutesokiged.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/jobuterusivigufowiwakigok.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/23664375490.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/jebuxa.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/48922692694.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/17987383840.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/69334198138.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54b538988---50743873591.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/30935400754.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/62483471234.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d494f5f601---lipevoseriw.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/59331678966.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/92625632296.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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 11108 bytes
SHA-256: 2fba6a41ed4e497c54515a6dbb204dadafedc7b17b9ff1f540a37933fa81faab
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 17864 bytes
SHA-256: 641aaf049ae999fa50fc881c70198c68e50bba5e16bd35933f947175ac8fad79

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