Malicious PDF — malware analysis report

Static analysis result for SHA-256 da53391b4ac02f12…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 08:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 833df9f3df7dbe6614c80c1256c6e472 SHA-1: 59b3a7f49ba9b1aaa8fa9ae1cf5678d7edcb31e9 SHA-256: da53391b4ac02f12f6628efb48f1d3028d0d103aac33802639472f7e6f2bc847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs and a specific detection name (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://ingmarcofaedi.com/userfiles/files/fevikavalelon.pdf In PDF document text
    • http://ppfi-online.com/userfiles/file/wixenexawifa.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/44368883874.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/satufewumepawalena.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nofisebepesefotuwara.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gabakor.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/guzowuximav.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/5807550592.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/12030796098.pdfIn PDF document text
    • http://ndt-ultratech.com/files/20698909210.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/2853138962.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132844476d3c---61991439612.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/37979102153.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/23395601330.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/natab.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/2190385962.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/zijiwimaxakabi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/65471487383.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/dexedapebopexuk.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/84056346166.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/bexinopupuxenanazepa.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/rakevipatofokebadijolukep.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/67460888296.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/10934652861.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/sejotuxotikezojutogadix.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613228e9cd6a3---mipas.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2b3863c4---dawatelapalugisuxi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/pasavukopirinanubatobowix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dns+blocker+androidPDF 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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 18100 bytes
SHA-256: 08a5c6403160a6f823e0971c607a8e54a05099db6d588af6bfa5da791ea407b9
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 10496 bytes
SHA-256: e5be31db93c876c3f2acc6b348c621d00e716f2e8c5d645358c29c483861b91c