Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a4eac2920350d3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 09:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: daceaf2811fadfc558c46ecf700f7ab7 SHA-1: dbfaef56206ae8b3626237ca985ff7d49e1db5f1 SHA-256: 27a4eac2920350d3404297aee4df4984645d3a77b6128d81fc4cdf26e0ec7093
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this as malicious, likely due to its function as a link farm designed to redirect users to potentially harmful content. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bdee9b52f2855e053fe7a42f8d87bb90/70866684672.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/90075815144.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa468951a4---21467054073.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10325851619.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ef93df2---73856671459.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/65105115436.pdfIn PDF document text
    • http://palami.by/images/file/51912254028.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a81d900c---82825450471.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e7n8kltl6i3236roseq0gmk1g3/pefiteludij.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/budavupuriz.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/27357845184.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad463450ed5---sikikegenajelusizevuxozaj.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90389bd35---68857909022.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/61164784663.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/75300ec5864825548a15bc70c6061a80/bikipapimezepege.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifegoram.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691f9cbee9---5010369887.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/5216300006.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/406760fe3835d660f270cbbac8c64a29/waxenaguwukozodagelemet.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/65354673840.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/25808666151.pdfIn PDF document text
    • http://goldia.cz/data/file/24510003224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pentatonic+licks+pdfPDF 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_off0000b83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83F 10608 bytes
SHA-256: 64d8dbe3442153f28759138000bf8854bc0c1176da9651da56f140ce191deac3
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16636 bytes
SHA-256: 0438f9f31ade5159e23d722ae1e8f478cac92f794a554290e40aebef74e35bc9

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