Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ff46d52fa33d0d…

MALICIOUS

PDF

77.5 KB Created: 2021-10-06 06:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 771719bd790eb841361dafe3963dafe1 SHA-1: 15ec574d68ea76abde25a6b38da70324261f4ab0 SHA-256: d0ff46d52fa33d0d6c09578618192f18618060251a138b1bb7da6147fd3ff2b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chia4kids.ru/ckfinder/userfiles/files/gabajiloxudikun.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f9691a33e---68971644145.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/32961508964.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1615152474900d---69526527335.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tovamobux.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///52239642687.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/65193674265.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20211004080411.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/timitemigudifunexipuda.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/dovaxop.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/82016134768.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/daxogamowe.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/6958567246.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/mugiko.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vujozemi.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/8086793653.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14253568671.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/44494165732.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/33787284499.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8267d6baef36000d8f2e8fa9a04b5fd2/zozuxefepetelu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nevozasozolabozukuzige.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614982ba1e013---wajefebavatesi.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/27663258656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+shape+with+7+sidesPDF 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_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 17840 bytes
SHA-256: 232e514d87e192d69e8f6a5064c9142c3860273182b3be18255405b4bf162929
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 10216 bytes
SHA-256: 2f8356649e0c4729f4f6378cd95103e15aa480a78d1a4739f3760939397e5d38

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