Malicious PDF — malware analysis report

Static analysis result for SHA-256 3608d7a4bcd1006d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 23:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1035ca36e687edbb7831b3e1328cacf9 SHA-1: 3d53006520a879e3eb14549172abc3ac63f919b7 SHA-256: 3608d7a4bcd1006db977f7a8a31d0355cbf79cc1ff8d818da0187b6d2eb8e87a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://oniceh.ru/uplcv?utm_term=i+earn+apk+download PDF link annotation
    • http://n-production.com/upload/fckeditor/file/larirexegeka.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/xujerelelejazopejarelod.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2oiihfrl1obh5ldi7pfm0itj2/zukapij.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415a6752f79---xitenomevifif.pdfIn PDF document text
    • http://rayanchem.com/d/files/kojekekuvojimosesirojiweg.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a6635df---damisagisenapozapog.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/68622905832.pdfIn PDF document text
    • http://aimic.com/userfiles/file/parafijepavar.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/mudifelamizu.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/74942255631.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/44159863911.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79aab0c2dac311f471b828454fc1dd19/16112668997.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4a45035b---kagenisifaxenasefodat.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421ba41ac8c---fijiseropapibuwufugipo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/dekibazixaberonujere.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/wagasarofudur.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/puxefumizulukek.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/jekugiregorenirajubejir.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/77862561144.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bazeladenupobam.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jijobegikit.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/70860563157.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rugubizanivazapawujesi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/98025075185.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pejanomupav.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/xutijavakewi.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_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 18152 bytes
SHA-256: 2d129c0c693e788649e299ef9443df2606d7bf2e27b325a7612c679a1d4af4e6
font_01_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 10156 bytes
SHA-256: b928a36bd095b9d44092c43f551bfe9caf9fec765dc6d4b47681611336d249f1

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