Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0d496f38389417…

MALICIOUS

PDF

79.0 KB Created: 2021-08-13 04:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8a08d5fbc4d2978d6fdec337018af12 SHA-1: 3332aa97afb3d4e1d74f93cb277b487fdd9fc0cb SHA-256: 9b0d496f3838941722a468024e4c53f32ae1065e08e8d076c3d52a1cbdd443b9
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a link farm on disposable hosting and points to compromised CMS upload storage, suggesting it's used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the document's structure and linked URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://isystem.hu/userfiles/file/12664219992.pdf In PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/pemebiwiluxolibomafodame.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/pizater.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7af2b6197ff99abd1be9f8dfca03dc10/44173146382.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff90bfac7---vonejok.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/lotalekowedaxe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/64oilt00cgp7jcmqq2h19clrpq/kawenekiv.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3e5d9155---gaxavodebegadesunitasug.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/63378150371.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0171239cd2---zediximivakituxabogazi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210722211235825420h4v3511gl4jg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b48ahj5ej9aoepqaj2cg5m3m83/lavamome.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/380b14443f85377ea6d7b84d98340712/mulaterojunelu.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/31842562046.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/28795059272.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/842ec4b18d14bc4b89bc14903e0a48ff/fedolodipamubabute.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98862958076.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/vituwiri.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/fojunekitamutozi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/faa45fead3dab9c513180f61e5f38fb6/87942192437.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xowulafof.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/vogepuwufeku.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/zuvinonojizokojegopubu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/1416992740.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160931747df818---lodadine.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/43285404283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kis+kisko+pyaar+karoon+full+movie+download+openloadPDF 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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 17012 bytes
SHA-256: aee4f718e568d0fdf19bc26f10fa55d9e0fcf9dc0e34d621bd293cd3e0c7d41f
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 11012 bytes
SHA-256: 54f47d59ade550b979f18512618e3a5fc9cbd60c4e550454991c06497673135f

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