Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7362e0558562f0…

MALICIOUS

PDF

91.8 KB Created: 2021-07-28 14:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a5001669b1aed6c4a95bbce7ed5564bf SHA-1: 55af40132c6389dcb32bc3f79db159803273dd1d SHA-256: 8b7362e0558562f02341a2adf3a66310168aec7b9f77f5afbf9aa2dc376764cd
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ahchala.com/img/file/fodaxapodurubikefazes.pdf In PDF document text
    • http://n-production.com/upload/fckeditor/file/97933400508.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tudowofaxis.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96652e5de---tujomeganejiruzawox.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3kuhrqctdr8s2hrskcsl0pk9ig/jibeginapizixejarev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e030b8dda8---telimag.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835189a7a40---kekogixarof.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501202159842226822.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/25746480454.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/77040165174.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/72854254099.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/78319149928.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c63b587a---10849259660.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/de02d2ba23b46f132ecfd1f6459392f0/32693866801.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/negad.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ej6gcdtvm52vka20nou3s29vsi/7240063402.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/nolufizagogiruwe.pdfIn PDF document text
    • https://digireg.cn/upload/52561490600.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1595fafd08fd8b1d4fab26d837307b1e/mofaguwoxupewukidozit.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/70002256666.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/38113778843.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/suxesiwikened.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/019b506c336432eaf11fec4e47cb5508/89412337631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bytefence+anti+malware+registration+keyPDF 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_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 18916 bytes
SHA-256: 526d4429050b9fcebda152ba65e01fe39c3f42a5be12a4648962b7b3f4cf4cf9
font_01_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 11024 bytes
SHA-256: 2ee4eb5bd79574039b195659e68164b95f21d46db3a951b8f34fcee45ba1ae2a
font_02_sfnt_off00014947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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