Malicious PDF — malware analysis report

Static analysis result for SHA-256 2556964713d440fe…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 04:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 356b6a15957d5632291f0798d7da0c68 SHA-1: b24c838c068019b1a3ee19944b3847fdecf8b438 SHA-256: 2556964713d440fecd05bb84c62780250b11e92095e035a45be03711a2915732
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, including WordPress uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, while some are benign, are part of a pattern to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dagmare.de/userfiles/file/46493961684.pdf In PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19526042079.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/fekuba.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/zepowej.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/86983825747.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/dudubelekokat.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109220400044220.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pexipilurel.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kibawokusakowafiz.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/toporema.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109200747325822.pdfIn PDF document text
    • https://tcremich.lu/files/files/38146841974.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d3c1d8a22729aeeeb4422f270c2f28a7/movinudezomesapomis.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/vugurifelefiz.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/dikuxavakobixosevedew.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/81761935858.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/rubeb.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/2533701743.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/916a0e32fe717819663538a692edf029/kedufakipozodu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e0d1b2ac---fogovuwolapozolitekoxix.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/jomixorajalefokobuxepewor.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/10851554419.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fenolokuvebiviw.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/50107369434.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/83014776624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+connect+wifi+in+android+phonePDF 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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 14564 bytes
SHA-256: 6ebf2092c94dbbbcc5517c1e789674522764102c7a6698f66535f113a04bca1e
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10580 bytes
SHA-256: a087a757d0081538ee0b7aa76af107a36009e143affdb3c2d30371c0e36e8b77

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