Malicious PDF — malware analysis report

Static analysis result for SHA-256 d547a38cd6ae2141…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 05:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf8f0a5fb52fee96c0acb1ad891ed1b1 SHA-1: ab0e30a0ba059d01d21259fe42491398e381294c SHA-256: d547a38cd6ae2141008a4fda5793034ef7db44f9cca2b9090125f8d49e670114
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, impersonating a cloud file-sharing service to trick users into clicking malicious links. The presence of multiple links pointing to compromised or disposable hosting, coupled with the ML classifier's high confidence score and ClamAV detection, strongly suggests malicious intent. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://multi-accueil.fr/ressource/site-image/files/76941307865.pdf In PDF document text
    • https://trainova.com/userfiles/file/mizexidazev.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/57675796947.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/73ec2469fa043e39d919136a66dda157/57066586561.pdfIn PDF document text
    • http://favourtec.com/attachment/file/ganisidobaviv.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/xuzubokiwurajomabufazim.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/texabewagekujupubobakif.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/loxapezuzorodefe.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/denug.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wetizopakekekiwox.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161382d9af1852---79906440217.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/dasemo.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/fagidolukunomejiguv.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/topeziwovavopulosoxol.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/jijafilotilitarezesusanal.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kf6olg4pmdkivnmohrs7fsr3c7/fizafivawewifuvokowa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd42bed4a470dd3fe6af4512d148e222/soref.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/23hl71s73mof3eq1p7dc49t04g/sifufunusiwajiwenopurene.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/lidumivexurupaziwevojal.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/bulevad.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/xevaro.pdfIn PDF document text
    • http://bushurov.ru/images/files/37494547964.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/6021739429.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010307156087.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144fe6f9fbe0---64703991830.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee215fd69---47938759597.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0e0a234c64b09e4da304f12775bb8b06/77071122404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+11+not+receiving+text+messagesPDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10944 bytes
SHA-256: 462efa0badf0f72abb6fc088ae9c1f24996586eb679223a3055699794e471fed
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 17324 bytes
SHA-256: 763c3857d2d54547db85059c3067c0732b707cc74753538c6b7787df80c08636

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