Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d6b5c35b543f09…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 14:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ab388ab89bcb1dd86a26a5fe96c29a4 SHA-1: a8f60e7f785e79d8fef4f062863d50f217aee948 SHA-256: 69d6b5c35b543f096f3f73537fa918164e33e69669b85ebad531e02a5306b1dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites, many of which host further PDF files. Heuristics indicate this is a link farm on disposable hosting, designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

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 https://huntic.ru/uplcv?utm_term=how+can+i+get+free+pokeballs PDF link annotation
    • http://cheniou.handysociality.com/upload/files/vesujakij.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/89708634431.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/6771037680.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4f90e9c72b9e47d3588113f9f86e0f88/dijidus.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/10343098546.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/sukumi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/14358166442.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/wefemoregi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/98468942006.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/74978673846.pdfIn PDF document text
    • http://air-ned.com/uploads/files/13067678014.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d3742bd61a550df6e48a8ddc022d7ac8/menunogigapijojoxaxuf.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/borabinaliwiba.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/51202606842.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210904_2D5F0FF714BB54AD.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/80280074542.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/46069771365.pdfIn PDF document text
    • http://pololanna.com/user_img/files/59673338167.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76076337516.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wawepemajalom.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/pawapukiwiz.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/20189929340.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f28e666be---betiwujunoxojo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d6e6168caf393ee14b266373919a6ca/bosirivuwelewefavawoves.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 17176 bytes
SHA-256: 028b05b266c05f93addee40cbd932a2b7818d53362a7545fb96a43ac5764caea
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 10964 bytes
SHA-256: 33d03adc9ef010071688411ea4e85bafec0004a66e2cb5148bae63bb22aa9185

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