Malicious PDF — malware analysis report

Static analysis result for SHA-256 c147991f7d3086a0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 02:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6730ce78264a9c1ec89608a516c535a7 SHA-1: b77c7e247ef631837b82c5d329f08ce722df36a4 SHA-256: c147991f7d3086a06d6e9f514f6dc5bd7cacf06d438bbdfc0ad8976598d49171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=trollskull+manor+pdf PDF link annotation
    • https://go2germany.ru/files/file/25638434485.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108231812391998.pdfIn PDF document text
    • https://areicon.com/images/file/14178073817.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuae6lhanker0ded15g4sjbio4/zewewo.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/15815888540.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/govonibupasew.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/tenikidufivedexameja.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210707_5E9180121262548C.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d276e4a31560dcc43bf955a612578a33/43457135448.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7vcqkr7c0pb09v2hbha64ceko3/kamip.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fa7eba7a9e7dbacc9441a4417e9268a8/saxeri.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/xejisetibixituxelatire.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/09p7dgc7gc0d5ao8h898v81voi/66700247650.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/11365277334.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gejogikaregin.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/19418216178.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/13034324728.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bps0j0tr2r29a1omqqui6sllkl/72636527600.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/dugejuluriwalagunekunuzuj.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/97051074081.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f71fbe63daa1a94b2a2046eaa885347/titafisebupope.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30a1eca62---woxemi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zawefamodovi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a09870d25---gupozetigoduzotojore.pdfIn PDF document text
    • 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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10492 bytes
SHA-256: 9e2201b674d15a5639d29d81ef4841174ff30e88ed968780c11e4e00ae77ce9a
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 17164 bytes
SHA-256: 7bd101ddec9e245e35f619c14b6d523d2446709c2aff787eea0a9fd5fbd29aa6

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