Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29898f5b58771d4…

MALICIOUS

PDF

96.9 KB Created: 2021-07-16 12:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d62bda09b9f48d6636548be690259b45 SHA-1: f33c6082d703231aa2f61d2cb76846057fce7baa SHA-256: b29898f5b58771d4e2cdad3332918b2145c5db3fb3187d2807b78d38facdbace
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, making the document a tool for indirect malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ec1d3e00c59b706634da3c899f239118/68130466837.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/tugomawutojokugixeveboxum.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/62662838757.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210625082047_305611940.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/nexowamosixoforivupotut.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j0te0tch3596p0emlebioel4ni/sigoxopezuleri.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/91537774078.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/47481259067.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6164d13e6b---41370251108.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1be07d396---nidukukodakedexogurojew.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hr9usn30hufcs7c3712d9kaqm5/95860060707.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f88bae1be8cc2ad9a848b6b5406487e5/96483144124.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fizeletomapusorufa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e4390ad0cb7---57931727430.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df64adf76---fokumalurapaxatatufu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6fc7f8ca---wiruteg.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r3l4s49edm3l6bsigj0nko5vfe/rasaretedopanonaguwaxizu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609882e746755---86610850365.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/41661942279.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/tomadizuze.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d6b1924d75ef69bb84134f6f076152f9/xavodagoragofi.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/26417855624.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879e7bb3b53---repevedusejolunev.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/97685145057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=exercises+about+singular+and+plural+nounsPDF 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_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 11012 bytes
SHA-256: 1fd66d84381b31e6b9250ea6ab159dcd774751590e03084139f3242518fbb0a0
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 17248 bytes
SHA-256: 4fb9467d1927df5a8607202c19ab2f40b24e651f078f13bd99c7848979d1b229

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