Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d82fb8f25411f1…

MALICIOUS

PDF

74.3 KB Created: 2021-08-07 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14e577dde8e9211bf5895ee4545df77f SHA-1: f8e03c14563451683b779c0f11ef49f53b922107 SHA-256: 85d82fb8f25411f103a7b5a5bd33ce8bebf92f6c60fb0a14c8a9f2a8ba6fb72a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is unreadable, but the heuristic firings clearly show a link farm designed to distribute traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ba8d551e---21548557592.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4361c8d0---silupopowuv.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vamisavubuluv.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3e18ebe2---jedadanererani.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b0c42ee1558ef99e6807c8211d96264f/46824889961.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/35036888850.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5034c991---95058255906.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/82882928194.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a3b1c8aa500ac83d7c4d76cadfff01ca/93584824364.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0efe348c---56826686829.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/57530197233.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3bc39ea58---towekisinas.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/rivarugelunaxaxopimupaken.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/iiaejro6rub3khmvfsj299gt4h/tebotofunaxopudisivono.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/joregavivuwobigorin.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/tonufixuzi.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/rezowidixelezet.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/jujisur.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0714cc88---41420057656.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/44608320770.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/rolanumatizasuxixunukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manual+operaciones+rpas+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_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 10608 bytes
SHA-256: 22a05da3415a0b315e785fb3604b39173c85c59c34cfda2de2acca5ad9897f25
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16544 bytes
SHA-256: bba040ff8a3850afaa30dd138bb426df3998ec515e2a465946ed73b78c4bc4bf

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