Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdac78d42447a908…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bbd7e15635283e556f99691fcd2b7af SHA-1: 47a3f5f895270ba540cccf71a9d83e79998bbd4a SHA-256: cdac78d42447a908f46f5dce61571277e0254647786873e3169e8b9223727236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of numerous external URLs suggests the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=swann+thermal+sensing+security+system+manual PDF link annotation
    • http://nabisori.com/userfiles/file/30155769728.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/30107336855.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vixiromapugojedibesekowu.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/51523008669.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6098e57ca---difipumifebenulopalib.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/478da70cc2a0918cfc799cc386be3771/pesijixofik.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xomusigelidisuwa.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/91983456052.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1c8ac22e---tununiwozewagev.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/11254461258.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6epi0l2qb04dlts30t6e2n10j5/1960289942.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050402215513.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-03/6a3a18cff8d228d12581cc912a14a435.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iu6364o26sdmr94llunraq51th/26351176443.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f48076868---60785787093.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/sokujimuxo.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/zuzafaluvekegudox.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jabitokabutawujitumarir.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc66b06e4---rurukobemobazotola.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/jezejesufufovevofesagoz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/57480984391.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/19859495296.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/talelidix.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/26c4925dc604b2a14edba683e21f9da0/gatusopafiratijagegene.pdfIn PDF document text
    • http://veitali.com/upload/files/dalokagut.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/selotukonerebejaleri.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/xamezabagopasomubiwulak.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 18352 bytes
SHA-256: 2b44b90ffb552177be993ad8a05bb9081a6079b256a776258387b5e78630bc0a
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10932 bytes
SHA-256: d8c93dcb735a8f21da97e21dd43751b7b046af0a05ccc9d48cc42b6454d69946

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