Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d0197fcc612cf0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 09:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d2751b24e993d75c71af18a8d628180 SHA-1: 6f32b9385522e3aa89e3b70eab77d7464523b054 SHA-256: b3d0197fcc612cf0b3bde89ee25e372be4fe67a0371f20b2cbbc05f733564646
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 ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dekoblickfang.de/userfiles/file/dinivorefuzelerikebegipeb.pdf In PDF document text
    • https://pypconsultores.mx/userfiles/file/birugaxipelazekaberule.pdfIn PDF document text
    • https://papiratisk.cz/soubory/58065661153.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b6380831---xipituveme.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062317123247.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d0d603d600603adaae5d933e0f07fca7/ruzatapozawagapin.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jeluzad.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/doresamiwakizetasawaxo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1b221f19251924f34ffe02ff7e4063dd/fabezutim.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/tujimazivapovetavuza.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0d288a7a03687e78d51ba498f7e33f9e/38994186291.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cc6ff6231a2446c6b653c7fab2478c97/zowapirowow.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/14387162874.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/18105865143.pdfIn PDF document text
    • https://masihpt1.com/contents//files/bovifafefuxor.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/80278010cbcf44f200318b80430e4a60/26363281866.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/13122703652.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/23966482646.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608feddaa226d---jirediwomubixix.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910c113422f---mevuveto.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9c7fcd526b5b79f26f9c6a13a9b17cd8/19021350617.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609488908c772---bivosapapelasodag.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/99420530158.pdfIn PDF document text
    • https://menu2uplus.com/images/file/87105584867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=past+simple+negative+form+worksheetsPDF 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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 11052 bytes
SHA-256: 20e80520bdb6c5188761791661ddc99326294a4d378263382c27038b29f24e7c
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 17708 bytes
SHA-256: 59166608deb719baa69de20d2e8dd1f1d6d9b3208756f6dfac76b94cd4dea05d
font_02_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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