Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e61fae093fa1a6…

MALICIOUS

PDF

88.0 KB Created: 2021-10-05 20:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fa1e3ae025bc15cf350183e1d7e72ca SHA-1: cea1ee43bbc56255e6d102437df91d7b57bbe13c SHA-256: 34e61fae093fa1a659fc5ee988b8111a40d0769ba1326c4b364fbfb0956b76da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points to a common tactic for delivering second-stage payloads or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=8th+grade+math+review+packet+pdf PDF link annotation
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6e74586fcfd017143d912121c4403c09/xedos.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/44905720428.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c4f253b98d---42161225825.pdfIn PDF document text
    • https://serka.com/serka/upload/files/bumin.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/tizivol.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/92921631084.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/jojuludodifegefabi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/5939365114.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jurinufoxinifipepujumiki.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/92234881915.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f438317beb6d8e4c7a00f9015e91bbf9/87620823019.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1beaf0dc0---4253790674.pdfIn PDF document text
    • http://dps-bayside.com/uploadfile/editor/file/20211004001328119.pdfIn PDF document text
    • http://dobermanncz.eu/files/xuxawixewore.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/29214715390.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tibaruxewurevukaso.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615118598475b---54610308943.pdfIn PDF document text
    • https://aildf.in/userfiles/file/voxijunemukugazejoxeto.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/oufl3mlqu23mmtndnmc00hff25/36842352621.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/dezalopaxasobakigevibisu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150495cedc77---4898692542.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4d5b82f55---bijitasewu.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10984 bytes
SHA-256: ee4fd305f1cd08dd7c09d5a11739657d16208d45eab08dc793d26487aea99bd9
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 18964 bytes
SHA-256: 5566ef98157bd961011cd2385e96aa9136a4966eeba27ace59777cbf0c37ddfb