Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd45aeeb01c045c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 08:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e3973614d395e05aaee333becfd5181 SHA-1: 8542abd82aa8107ac5066fbf4284c8e29cd0e44f SHA-256: ffd45aeeb01c045c255a3eca6c3ec5b2f4f941a1ac016adb1840522ae071be86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://proartgaleria.hu/files/files/nukeladufejowiwadazunife.pdf In PDF document text
    • https://istanajp2.com/contents/files/37440768890.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6d94c4aac---xamukekekivutobobe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tgkhgb4gic27n0101anpm9gfnv/rupevatolumejunatal.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b2a9b7193---33607955178.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1085767af4339d8f5033627f042f74aa/zonikaminudod.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7d42eb5d066ef63554c9ecfe1de708d2/wipajexed.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1de748aaf1d191ac3eb5650f9617f9ce/wokepixujaxusikimumusad.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/3872267957.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qlk1qn9mfgh75srs3g6id1bdks/potegofirabe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc66d9e03---21045608026.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a3aed8a8---1069484589.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210610_25F231EF70C4CD62.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xijulemutew.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/saduvifamujoxupaka.pdfIn PDF document text
    • http://hnspkjx.com/d/files/75785275845.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7e6372bf2def1a5c361795d28e97e6a9/36672741215.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3b8ce87f6---kazebakofuredi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0a6370828---xulewujivokun.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f701e2c7798---99986489100.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/55685093266.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qor0d9ikp7qj1vh2m8g8inaolc/51569355087.pdfIn PDF document text
    • http://kotolantopeni.cz/file/batibavifatawesozupafi.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/fabiwofenaxurowifedu.pdfIn PDF document text
    • http://195exim.com/datas/files/27932384035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+letterhead+template+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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17388 bytes
SHA-256: 763fb94c8a9408d12cca1aaa44666952fba4b728426907c6e694cfe94e352a84
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 10256 bytes
SHA-256: 60e7ffae6ba241d874736cc9afafa346380f522c30b0ce7a271130d44e15714c

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