Malicious PDF — malware analysis report

Static analysis result for SHA-256 50207007cebd1585…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 04:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9ac2e05c57fb319b023919e2ce42246 SHA-1: 3226139a42beff5da6b12580eccdd18df15df71d SHA-256: 50207007cebd15852154cd80f762c46c3bef79a0d18dbde65863f1f211e2b304
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to distribute further malware or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d945e8c8---80982413284.pdf In PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6f8a717b2ee1ff4b1891c399e718dc75/47116425383.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2c30bfaf827dacf9cc78562494a9e8d2/9741965949.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0ab7ed5b8fb51122450b4d434ed0e29b/6902586566.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18811855cf---20629998176.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e3c0ce2febf48b3b34218158f8969a10/boderujupitoninajuburagun.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a7ea5956---tafirupamemov.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e969dc3de4---gemilabomarud.pdfIn PDF document text
    • http://abnicum.com/files/file/tokokomab.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9369b7260---wojogis.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a5d066d5454c255cccba7a15815c7193/vemonixarotevejal.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd607deef4---55391414592.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609212d013eb9---xufux.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757dae3eab2---jiriguxa.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/vikijuvixiresur.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be12b5a6915---rowemox.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609484847b9d5---99217318930.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3104bc970---jinuvadinufifek.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bn8funbfutdprjkp29iedp01e9/vuzesu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a283100c48de499e8cfcf5635846e052/68921852732.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/42386773114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=linear+equations+hard+questionsPDF 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_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 17520 bytes
SHA-256: 6fd4f0d66025b28bc5814fd318a11381c9f8d86b9994cf0764eb8265309a5d22
font_01_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 10500 bytes
SHA-256: 7dab2d4566fb441a00593a65e906d50d77e5a5ba78f41db6ea1d965e2e8f6089
font_02_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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