Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8113c98373bd07…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 19:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1c42ed11de9e61f904de31d11eac40b SHA-1: b1c4bdf3bbf9e81c2fed326c1f097cd524663916 SHA-256: 9f8113c98373bd07615e9b2e225f375d07200d34260d0c9f34fbeb0aee2fc396
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user clicks for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=apk+stickman+fight PDF link annotation
    • http://rutka.pl/media/upload/files/283021a8b979bdcdd9ce32568d2dd3ae.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/69663605615.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/kaxekikisu.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/nunupu.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/48894222071.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/ripumonuxamidifanep.pdfIn PDF document text
    • https://blugarden.eu/file/24241444247.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86379838579.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/xeguzemo.pdfIn PDF document text
    • http://koutingchina.com/upload/files/11032690715.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wixawenateved.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bipowukawexezu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mnrlu2231eka3heeeqsskk3u9s/80594244199.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xidokosenupefujokel.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138402cca8b9---jalipo.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/zixovamo.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/vogikekesufa.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/48480958174.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/12323586541.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210903213401.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/letaxojowawizudotudafinum.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136194353e9b---mekaje.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/98980466308.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/10338607156.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_off0000b7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 10600 bytes
SHA-256: e4421699e1496eb626464e87cf492b2c146ee0b0b9c819193c3a925fe1c5d27e
font_01_sfnt_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 16504 bytes
SHA-256: b54ae7abbc6ba5f1396330cb18e348adb8c860243cbf2ea12102ef8002e39bc5
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.