Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb4035827719688…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c43d587ef30580200c0dfa9723908d76 SHA-1: 726b008c6961a6d747381717081eae72778b4af9 SHA-256: aeb4035827719688a9dcdfa68633de47da399bb2e91a031defe32121d5f0c968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of multiple compromised CMS upload links further supports this, indicating a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=ammann+roller+manual PDF link annotation
    • https://planet-for-events.de/userfiles/file/tokezobil.pdfIn PDF document text
    • https://12shio3.com/contents/files/64609696946.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/rumavoxuvorixinavegu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b30beea8909---91279628335.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/wamadokemamex.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215e761a98---kopenijaxeke.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/gofudabevatutegizisafozew.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/kolapitazusinuzidegemik.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/kebipux.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hslibggtg3s15krdlqrbba4aja/tisewonoxenezewakasi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42aa8b72c---34832458176.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/65821918157.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6842f955f5---matarufumakibawejesuwizof.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/93903336442.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/jafowomixi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c06b96d6---ginibavolibojemuxosolaf.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbc1eebd---88413774573.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vmtk3gqnd97plg22851hpivtjc/lujowu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df717f3ada---37576794474.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/359faabdfe0f55ec56c7c380a3033adf/14294572182.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/91389368709.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 16612 bytes
SHA-256: 0e1550820075cd7dc3d7d70ab316c3fd511750f692bc46671d06e0d7560d9d49
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 9992 bytes
SHA-256: 8a2b8c16baefdac65c433aa916ecede0d6dbade6debf0ac87b2d79ecf6a50f17
font_02_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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