Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82c41a713bf9201…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 03:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c0dfe8cfd28cf9dfc58bef226a689a0 SHA-1: f276b81ecfd6affa94027fe5649b6ab891b24d34 SHA-256: f82c41a713bf9201ad5e5aea859f2ba4c5093e1a42746f9e426e2b4dfd197262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stauber.lt/images/files/xuxozimobiwuluvet.pdf In PDF document text
    • http://z-him.ru/userfiles/file/nivimawinolofe.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bezawopal.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906091656.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cdb8e57c---4791241031.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/47062161079.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/83597630168.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/kubupojajivamisogafotebo.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210925_032810_5167.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kuzoravovujawexogir.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lunokitap.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/87967193256.pdfIn PDF document text
    • http://tipiland.net/upload/file/940810246.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gijobibapower.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/bonoberaxilurivanul.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/95449735212.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/vokabugugekadoraviwitix.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/bavijijejotewibulapaz.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jitarisumetinakuloribewer.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131f44c4babb---mulikavalefifugileguk.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138877e22d8a---9792829857.pdfIn PDF document text
    • http://davobio.com/upload/files/pojogumizibeziwul.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/30161169006.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434fa82b0ce---duwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+retrieve+a+wifi+password+on+androidPDF 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_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 16360 bytes
SHA-256: adaad4f7c33588183ae45884b679c76592f7eda0b4d5b06a3a855cf6a3a02b47
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10588 bytes
SHA-256: e39e02cc88dc6a3c5861635d86d9c73827ad201c3af67f6ad6bc8dfdddc8efa0

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