Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dda0fe6fb1c95f6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 02:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 643c8d9bf2c7cc9fd8647da1797eaea3 SHA-1: c3c78333de79ce38e0914fade5f40476754da6f9 SHA-256: 8dda0fe6fb1c95f6eef75779b736d0df2162f8e9ea02a1fdddf3eb7654edf843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aodaibooking.com/FileData/ckfinder/files/20210911_EC807D9E4F877188.pdf In PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/85933222.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nelubelutubeda.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/milaripumunowubalojaduw.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/38419549846.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/zadodulob.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76234726653.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613329709aace---23555196568.pdfIn PDF document text
    • http://ridendo.cz/files/file/52725997336.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/60704569061.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/43962637949.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096634f918---89408121033.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/65213091046.pdfIn PDF document text
    • http://clickvay.com/upload/files/lerigixurik.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/womimu.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xukewugon.pdfIn PDF document text
    • http://gapp.fr/medias/files/divukiburitimuxi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5de4f6e97034f7969c4b74ee859b7175/gusogoxov.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/javoxeduzijunivupabeti.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/luwojowav.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33528857054.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/26054013441.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/gidawafo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613517995bdcf---wuvore.pdfIn PDF document text
    • http://aweibel.com/Photo/file/9864901316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=among+us+hack+apk+2021PDF 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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 18996 bytes
SHA-256: 314d952901d9d755a52febd18ad05e82a93f26abdaae66dd466e0a3b17410c8d
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 10820 bytes
SHA-256: 31834947953ec57564db218f4fdbcc9937491d76f3a4a865b43a58fa7f104858

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