Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5224b4da561cfc0…

MALICIOUS

PDF

100.3 KB Created: 2021-07-05 13:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1686a531b045b87bbce6fe1e52ab6ef6 SHA-1: 0b3b60cc2dbaa16ae4467d5e773fdab02403adcd SHA-256: f5224b4da561cfc0d40219365b4c5b24489d6a88d98a89f876cfe3e25d7457bf
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://smidgel.ru/uplcv?utm_term=bluecrop+blueberry+cross+pollination PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779ad984b4c---soxiworegaledeto.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e48271f4---nasisenokotutokibifuka.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/28666434993.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/juxamu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fbca9bef9842fab4fc148f88ba4c6180/lujimube.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3ec6ab6f---ninizidogadufu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/943f87ed49f715cf756d5d144ddfa2ab/1317766076.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/40707672922.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/72e57tobk0d14s82d1g09970mu/lotavisof.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g82d8nbecnqasu9d1208md9sm3/dilekuwi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du6el84q9rtlca1rn8mp7957b3/43260503868.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/417818a1a2af56547b4aebb9602ded32/26359479802.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zodedugeguvubunonelagab.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc71a7fe0b---motakule.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a46598b53---48180238548.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e9718304dc530dda51ac4e1c743f85/tovosugu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/27017507896.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607649db253d7---9035201469.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f58461d---gokadidibunuzifuzonibuz.pdfIn PDF document text
    • https://kham.vn/userfiles/file/63265940391.pdfIn PDF document text
    • http://hasekei.jp/userfiles/file/modisuziwabet.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cb99d7cd3fb2db1f733221aeae902162/loloriwejevamubi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zaxojanivabe.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jukenemat.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da91e4a9f59---77989414914.pdfIn PDF document text
    • 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_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10772 bytes
SHA-256: aae6df89c741ab8e6bb3c1df8f916f613c515524f3fa3572c08963b171916f6e
font_01_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 18156 bytes
SHA-256: ef14a75eb55e1282b44ec997ccbb7255fbff1c8e915b4dab2ac939da081b7c7a
font_02_sfnt_off00016bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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