Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec74e91856398909…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3edf955c768a4d6542c88f96d73eee56 SHA-1: 7d73d8b559ec7b754cd2a8cf492190c047f23cd9 SHA-256: ec74e918563989097fd2775d639b439ef150618877cd2b46ed23fa462d0df304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3f0aa5f45c2a462dc152aac6777d7bd5/2507471183.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/uusk0gq82sit3m1fc614q30kr7/73437059044.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf1fb61c90---21806461938.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/43769984049.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/buvunozuxazefuxibiruro.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vunox.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jizewo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/468286631e38102536bfeda94029dda5/23964931895.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/65728503385.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/depuxuzujofejaliwawin.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/saputefunapigadik.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/94198395094.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/53015041570.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/dc77c4e750fa50cf3127dfd2aab4eba7/88866794907.pdfIn PDF document text
    • http://zgic.ru/!upload/files/50012855677.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/50142483203.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/93093618275.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/82414945560f357d856798.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75966684072.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/90ca38d1330329cc5051290e4ed71318/36968381732.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/1keug6ghf4guchh1ept5npa7cq/83614035829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=coaching+and+mentoring+for+dummies+free+pdfPDF 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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 11152 bytes
SHA-256: 1c1de4c776130a9be48238609515b6075a119c8f6f8221c1e1679a7cff76b420
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 18128 bytes
SHA-256: 9625caacd7203de682f94118d87aadfb23c4179ff0be0873fbe2dd1fb0e9ef2a
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1