Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7955b8b9ef6179…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 11:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41b69f3d838d72c82ea87ca26fb30dc2 SHA-1: e3bac72ad8347ed7d55426c6fe9f34b4434ba9e3 SHA-256: da7955b8b9ef6179e01c2b747377d5fe30c3e836e08e062728a267d61dfe9127
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af59441c3a---28343097011.pdf In PDF document text
    • https://ecohort.info/userfiles/files/ludifepug.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/safawukotaxalitutubeguk.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/vilebugerekikuw.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/198155699.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/jamoga.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/sivuwavin.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/jarejuxatad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/42519100729.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/99153970280.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/86161716456.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/18221610398.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/43771773739.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a06a1e9d4---1140625538.pdfIn PDF document text
    • https://fuoriscena.eu/file/bimitorarilerisajonel.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/54260844152.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/73115804241.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/sipamupuzipuzizojeniwo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/basexamokabimefurik.pdfIn PDF document text
    • https://mimpishio.com/contents/files/xivogupifij.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913130830.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/duvojajobojizos.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/kutupesidaperelegane.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeebe8569a---zalel.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/gepojimesele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=narcos+watch+online+for+freePDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10496 bytes
SHA-256: d079e37d6326c4937aaf0dc19b7be43608caca5d5d60eba550153e36757e060e
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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