Malicious PDF — malware analysis report

Static analysis result for SHA-256 9105d6cadb0322fc…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 05:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e982a51cef5a0adc23a56643750f2b7 SHA-1: dd2eb002e393294ab32a1df64d95767db9725ac4 SHA-256: 9105d6cadb0322fcf8c1e6161d43b2b40034fadaf4ed802b9179f825f98d46c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://atl-50.com/files/file/5806657616.pdf In PDF document text
    • http://ondrejkocar.cz/img/file/zusaturutedifaw.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/27480662377.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/salozoraredarutexo.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/lumak.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvalaxizowi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/33pirkj59sqjvbu22vc2n23p7f/mimuzasitupubigunuxovuve.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a6724433b7ae255b1ea6a81d7b36b463/34942568445.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/19062534128.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/jerodemaje.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jojuz.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210630065606_iga6g3.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9108574016ed542bf073ca3f2cfcdbad/getubapesito.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/43728812878.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607cc309acfe4---85146106616.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/75042695079.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sodididol.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847860c50c7---14550566532.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/xekomumivibaputipel.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/55827248973.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/1401521634.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/perezevojunujoliwesare.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/28981598025.pdfIn PDF document text
    • https://kawanmto.com/contents//files/zajaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+can+you+copy+a+pdf+file+to+wordPDF 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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 17580 bytes
SHA-256: 740631e5440b179ea1bd2589f3c0e5df7c6a1286af93c9aff1d3734144b21fb7
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 10736 bytes
SHA-256: 92b3e8bb1e386d66ae0432f942e42b969ab263729358566d86adc6d1d9f76ec5