Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfafbd3ac92edbf…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 11:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a959b31645cbbc8d5ae281d61695aa11 SHA-1: f41476b9a3c8be8a6717eb53aa75fe8237bdb40c SHA-256: ecfafbd3ac92edbf535757b58c4be8a99d2a23aed914186479cabf8e5b2ab9c0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://test-immo.com/file/78780964054.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219903b9e9---kojoxazezaripuzufodo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3229c9f6---bakasakijezivagisedetetad.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/18902605843.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/foruzemuvokojufapubutemu.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/33956769840.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67769040390.pdfIn PDF document text
    • http://kaies.net/upfiles/210902231205935019828gvv.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jaxixodiwijuler.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/16899232864.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/metubajazu.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_4E8F074BBFD85C7A.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210916002322.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5aae20cd43a8f79146ba116896b8164c/goropopozew.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ad850b51.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/60693866768.pdfIn PDF document text
    • https://akconta.com/uploads/files/rotimusiguwofilefizamete.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/6747679275.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tibapitunudelawoxolirev.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/nigivilikibemiwumupizope.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6666584474.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/metuvosifunagidololekizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=simple+login+app+in+android+studioPDF 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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 17284 bytes
SHA-256: 4b7dc79920fdf129c2724706b1936810b6c0345701112af703a34d15c365f23e
font_01_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 10908 bytes
SHA-256: dbe0535f944f7920b4788a2ae1c8dacb4799ebe505f95373a51e4e4d43a838b3

Open this report in the interactive analyzer, or submit your own file for analysis.