Malicious PDF — malware analysis report

Static analysis result for SHA-256 4280c1ae6090fea1…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 14:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bac76e85ffd51dd09e463805d5a69cea SHA-1: a3f971a279b4f4c2b6dd043e49a8dd75622f2696 SHA-256: 4280c1ae6090fea180a575673dbf72aeb6d2bfe7bc5718aacc440c6a51b497bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/3632310311.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/xevebomazabime.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bejofasejev.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/gobawobi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/20496470178.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/53258803358.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985b351785d---wibelovalizabu.pdfIn PDF document text
    • http://charivne.info/images/file/21556561634.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607107a589aa6---lipaledenedufoxib.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/84291900796.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vf4id1ddh9lgc2a8oac0f6fvde/8387285184.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/rexozurakokipa.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210706_0D9EE3A73D77985B.pdfIn PDF document text
    • http://emaaravm.net/upload/files/79872179937.pdfIn PDF document text
    • http://falerisztika.hu/tmp/pibeziko.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b01f44tda2qacmacb7kv6183d4/lovopawa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/uh1pnj48g57bsnm68vvkb2hivp/50241010370.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/wikifokesoxebovus.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nogavusenuwomitojizi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8be4d97fb0be3f8e0fe8b6c879a8525a/wumalaxezogolawebapo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/31239929326.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/88rbq0icjj0dagsm3d20l11fvg/livojidomaduwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=materials+science+and+engineering+an+introduction+8th+edition+solutions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 20532 bytes
SHA-256: dbbd82e48d34fc0ef45b78cf315908cae283715b79c42f1abd54b5fb68f8ae40
font_01_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 11200 bytes
SHA-256: 4ec53c61a543e88ebd73f2b84dfec89db7386622ec63eb5e3d217c51db6bf2c0
font_02_sfnt_off000150f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16902 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d

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