Malicious PDF — malware analysis report

Static analysis result for SHA-256 48583d49f6d3c5bb…

MALICIOUS

PDF

77.6 KB Created: 2021-06-26 18:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc0a3e39c4843bb9a2c2d9c2dfa2f25d SHA-1: b92796886e7fdebab9f0f54e992c4ceeb309f3ce SHA-256: 48583d49f6d3c5bb508d4a0963a39e335282cc35bdc270b00d6d178a03891496
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of multiple distinct hosts and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2tj6j09mo4sg4cpeemk2s54phn/61911547646.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774dffeff28---figunab.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/745be92de2c64110f5fed688309be331/gawuwowuxexejiduku.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/597348b06af3474600428a1c9e6832bd/72143213152.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/binubinetiro.pdfIn PDF document text
    • http://abwva.com/uploads/files/49371936228.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608347490ea64---nevawagakorujizidefevofi.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/62566998068.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b719bcf55---nonudoxejivutasizub.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771a58bcc94---boradepomamajiwewa.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b21d2232---polokujeseluboxurer.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/82926449262.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kedapoxu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xoviwomej.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db4d69cf2---pasapofibarinaxedodide.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d48f5cb9f38deb2e147839f1ac7bfec/28623931391.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/uak1605kobbh5rkgb4sdggv7mm/gojopizetobofi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e41a645b4---mogonitokerubazudud.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5acba6b5c---41358621384.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cjrcd6iuv6frn9enq55u4lupjl/5780796687.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/8828093111.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/onp6vcr2hckr0009ng6eb4qi1p/88648897189.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/525261dad82e698c9898814ed7c796c9/55470104110.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075efd3ba03d---72968636065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mcqs+test+of+active+and+passive+voicePDF 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_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16808 bytes
SHA-256: 5c291fccf9a3c36861d2750f085c52ec03cf2d5c199ebb76fa04980b6c03fa04
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 10672 bytes
SHA-256: eed42f0317fb21ee70e672c5f3168c852767fda469698ae30d81cacb25316d49

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