Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f176938b2c5b2d4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d617752ecec2337a2ce54996c0caa32 SHA-1: 36a0ece0025c42404354966e974d1a50a5f1c45c SHA-256: 8f176938b2c5b2d4efd951a04d86988e3fc6a8c38f7c9ebb6748b0d2ff6f5cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://postelezmasivu-plzen.cz/ckfinder/userfiles/files/xefozabeditiruludufap.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/wigulisejulujekidokopu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5adaa5319c5c4f9d772ef77b8eed93e2/64841850401.pdfIn PDF document text
    • https://o-dance.com/upload/files/26705259260.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/6060576822.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dbd69834b92ae07456ddd5c7871e7b61/tatadamowosoketujaw.pdfIn PDF document text
    • http://lagrupacio.cat/file/gopufugigutu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/volovo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d6bddc5036786bca45ab746cd89f6dfc/75229483041.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/goporebepelixig.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdecde20a4---29809813918.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/muredekivadiramel.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sibowufa.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xinet.pdfIn PDF document text
    • http://tano-cable.com/d/files/gigad.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d7970c22d---35405531014.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dotekasoliwaxuke.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mv73710rthatid45q0pgl2qku7/pogujekolofukujimiwigaxif.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/juzofuxolugaxux.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/25704038565.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/58215088925.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/2940328992.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/xefebeda.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kurifofiwise.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3s30lih6mien5of44mphk567b3/91517290114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=biblical+hebrew+workbook+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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 10716 bytes
SHA-256: 013ceee41fb18da2b1b673ff90027799ce863e2c907ee2e8840d8aaeec685138
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 18568 bytes
SHA-256: 19db23eee55222838f29568131c5ce0d0ef9cf1b3a628af4c9f925eb8b38d669
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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