Malicious PDF — malware analysis report

Static analysis result for SHA-256 daceca5c516eb9ad…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 08:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f7a66d64dae047e92e65e7e581de903 SHA-1: f60aea49a0db77b3dcd6c71baca1010c6724487d SHA-256: daceca5c516eb9adbca672da1254d50d8433c9f475e0f6345e336365a3ca7776
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a visual download button lure and numerous links to compromised websites, suggesting an attempt to trick users into downloading further malicious content. The presence of multiple links to disposable hosting and compromised CMS upload storage reinforces the phishing and malicious download vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://justbuymeds.net/userfiles/file/29393636489.pdf In PDF document text
    • http://phpirateboosters.com/clients/867602/File/zobuzu.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/92783752777.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/sexedizifagevosukuzulaw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99ab9b9cb---mirazifewimatufiwere.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/96390362852.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210614162368715399.pdfIn PDF document text
    • https://codecs.roimages/file/muforarikeletoxepeguxis.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/seronafutiluleri.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/wakabujobaguribigeperi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e3ad18976---dibedifukanivuxuri.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9a7968f3107061044ccb8a3df94e21b/sumofi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b770177d4---zivixos.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/lidipodipas.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bee54b5b5---vapudekajoxafuvukap.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c93342368e7e52ba24f8904f04b7bc29/gonimatabejipobosubek.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507094814123.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/50955716590.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b795fd1a3b6---zobanarasoxabusonudev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=westlife+songs+mp3+mixPDF 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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 17656 bytes
SHA-256: 65f7f57432f21505f88418d72b789b0217cdc171272becc4bbc438ed503021a9
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 10708 bytes
SHA-256: ee564bbfc572afef70a576d4264ba3b9391197f28dc4e9607321195c41157468
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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