Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8239bced62f77d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 523c348683a59b506bcd130e9330adf5 SHA-1: 09bbaba4ff0607ec36069ec3de9a757d9629c9ee SHA-256: 7f8239bced62f77dc43debd0bb953af5b840e3d5b0b7c7243c817a8409afb123
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection as a phishing trojan indicate a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://profitaler.com/UserFiles/file/rugupojujokunigoru.pdf In PDF document text
    • https://motoquadro.de/userfiles/file/pibegedomufatusodedogawe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409142f1e77---tefepujepiv.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/24034242232.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/gopuvixuwawoposibazex.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/difogufojumivudelosu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/111758073447.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/sibajobibujatadaf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb8c22503---dutozinikapovonaxaka.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/pekapodutododurudulor.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/99266984007.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bafekevud.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/redej.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/govuvobokazilufenedavu.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bevagatugub.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bixoj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146fe9ff160f---rugatoxupisikakejikiz.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/jewemibimituzunopegi.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630981260.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161449d11d3848---wanotajomudabu.pdfIn PDF document text
    • http://indexone.ru/upload/file/52142406797.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xulodosegegasemimebot.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/rirakuwobifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=assassin%27s+creed+identity+free+downloadPDF 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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 18048 bytes
SHA-256: 03d26f5ad6a0d79f234c4aa339658aea44a2995e07505d9f03e0297800216c6f
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10684 bytes
SHA-256: 07fbbd2a87461eb41fbf92c14fd1844e4e854f824e6688e232759caf63765b69

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