Malicious PDF — malware analysis report

Static analysis result for SHA-256 569e1d67e7784f8e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-21 20:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efa56493e374ae35691042f80a786a1c SHA-1: 1bbabda4abfe7f1585ce0087c64977e0bc409e49 SHA-256: 569e1d67e7784f8e77f26be3097f795bc6c45478783cf344a7609719dc76e25c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress installations acting as hosting for other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a18b27c38---mozuzet.pdf In PDF document text
    • http://friulanapanini.com/images/file/lupukuteguxilugopixoja.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419f9bdf175---vixuvejekowipapuzalevadew.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/xebifalukizutal.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161407eeb005e5---54257470483.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/85375756480.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/53966073838.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbe1b1edc---44653402140.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/piwad.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/29544280007.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090305004581.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/zozosokox.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/8416312683.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/95505996204.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fomutewawusenulijix.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/67979959398.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147af9cd555c---jijabaworadoxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a041a8105e---64764739376.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/jokikegutude.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/midasijarofof.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/gexigibejiwemosem.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/ruminedogupoj.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903114917.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wezukaxigewokubezikanuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=x3+pro+vs+x3+nfcPDF 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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 10288 bytes
SHA-256: 3d5032f9d7ba7cd701cc578c656ea6087d821671cf13055fd7cd637f9968b814
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 16560 bytes
SHA-256: 84aabd389fe314c34e5b718c190be77f923cd126f564c76be4eec83d94046e16
font_02_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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