Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2aa870bd6bbcd4…

MALICIOUS

PDF

82.1 KB Created: 2021-08-15 17:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 541c523a07671ef06c6568e3f86ea664 SHA-1: 30fc6329ce9d0fd6f840a9d1eccb3508b7c90872 SHA-256: 3a2aa870bd6bbcd4b618f89f66f56975ef4fbb03d40635be7948ad7fcd5bccde
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://problemconsulting.com/img/download/files/11802306792.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d22ca3746fac7c9a322085dc59554ad4/27361451447.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5bf000371b4492973d0bd8ae888e1195/waxutivananijiradinabek.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c022608251f62492cc614e40bac47c31/jajurujezapapaguguzata.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fatubovo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/setimun.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/voruforebovukepil.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/josejelatobusozenazupo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609188d1f0ddc---vobuwogezutajato.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ff01617c9---11873250678.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b339a830ce9---romuvizod.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nabuwa.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///18560895139.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/76897359818.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e883ce0c69302c8660017ebac5202283/vowikemobasuvineforeno.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/mofekug.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/80734870036.pdfIn PDF document text
    • https://blogsma.com/files/51518034447.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/motevugoxigitif.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1580809676.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbe9e319a293303206bb8684b9131fd/84937110753.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoq6rf5gt1mb55l0gtr4srndj4/xalewiwasisowunofomamutu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9835bbe5---fufikutotiwuvagunowaw.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071857eb7cf5---vubeperelibo.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/fewim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mcginnis+p.+%282013%29+biomechanics+of+sport+and+exercise+3rd+edition+pdfPDF 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 11944 bytes
SHA-256: b7d317dc112c1f12525d9d2890d050eec92ecfb7b74838ab608035a73ed99736
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 18204 bytes
SHA-256: a60276d18b58d9a96bbef37f99cd6f5684e4085198cf774bdd05a8150cec913f

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