Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c95c7c9fa5436c…

MALICIOUS

PDF

86.2 KB Created: 2021-08-25 04:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9996cebaf5f161df5f23bf24a1d5fed1 SHA-1: 9180718bb49298903b0fd0820cab12c06f76eb57 SHA-256: c8c95c7c9fa5436c9c4d43b740947bd13bafec476e72accadddb38e870440c34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=ch3ch2cooh+lewis+structure PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2df9b2e306---87259085823.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/samufitonuwoxe.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vapenef.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ea0696de998a5cb59ee4059110b1f667/33181797895.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/36129269911.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/gawaretokojezonakiz.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/limufebajub.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/83082977175.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/degomegotugawoze.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/kemepimetizedaj.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/78990463757.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/furetoxolijiwafevadejuko.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/nitusobobafovalalovox.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f9c3400ed25b75bf73b7429286673d62/4696282923.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/26787966ea1bb260b05f2a4219c56ab3/dotujegabef.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/6092049227.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0ec84126---39025987085.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/88717174987.pdfIn PDF document text
    • http://pk.mo/userfiles/file/duzewasoritufifinegub.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/12109477071.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa632c6e61---21459862643.pdfIn PDF document text
    • https://philcoastal.com/ckfinder/userfiles/files/xoboxepusof.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/684cca75d5f0eb91801ceef73977681f/bavirojuxifavexo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641094dadf---44540897633.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010daa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DAA 21184 bytes
SHA-256: f23661eedd957c86aae689e8b5a3ed66d65420aad80f1eb88072fd9f56e92c35
font_00_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 17884 bytes
SHA-256: 7daa4f9289292e7bbc2c74976d770b1fdc4388c8beed04f8402c7870fecfba0b
font_03_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 10572 bytes
SHA-256: 44a43635fe6f8a23703c3c435441afafc73c2e1d617c357f1e378e5c45f531c7

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