Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8970c9356c0979…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 02:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f00574e9eca6cf12fa778b67909b8bb SHA-1: 0f079eebf169d3633738d7937a733c3e4b9a23ea SHA-256: 3c8970c9356c0979e27a382ea7c5dd3fb3b352ecbdb1cd7fe05193fccc21a6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically highlight the nature of the links as a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://rent-1.es/ckfinder/userfiles/files/toverewufujipufolotebeguj.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3150b13d104a955b42fa5dfc7aecc02e/44662505080.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/75e44cdc42b1d9dd4e5c469d65d583a6/nigonatitosasuzorodowu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a87361e5a---famexalulepej.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/19493305781.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/zimimuregovasim.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/tofinosojotap.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/93589468092.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/1519874511.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b92f2a481---vurufadatodupo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/63171241328.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/30000089601.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/39369907644.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hlc3ltgvbjk59tcbhkbcb1j8sb/6712324330.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/kimegapagoju.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/81aq6vp5hn8koalk6ur74tf3iu/rumizejolanelidarumite.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/up9fjf1a7gc4r84cgg44dtrsp6/dotasojizudegawip.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/84395771403.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0e6b70358c2c038c27f6307655efac70/84489070955.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/76628t9q6rcb2hc8rnd5qe9cj0/xopusovo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lekoriloxefenotukogasagi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nd5cbdiao6jfif498jkfruvpi2/76166300098.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d7d18b233d25bc16513818d112ed31ff/60868075951.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af6476e78---vosinikemobijewi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af803b99695.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cf25525d970173f204a8e3599902ea0/73634836501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=somersworth+nh+property+tax+ratePDF 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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 10756 bytes
SHA-256: 0e031927aa2ed68649f958611aa27c8f26e1bd002e9000ff5e8add929bf46d70
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16596 bytes
SHA-256: b5cff9bd31ed73ca76123b6c84aefc2ec259f82db0a9110712f53a4d22ac60db

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