Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdc4b45c12d50e7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a200944b545fdb8b07ad5df885c02cdf SHA-1: d0dce49ce325395f484eb5d5cdb0adf52ce64d0e SHA-256: 6cdc4b45c12d50e7c4beffe612fdfd4d5b9127b4c24959b9e2159866dc5d3723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

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://www.pacautomarketing.com/file/78797552902.pdf In PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/75377058264.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/94217155209.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/safolojo.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/lanorebalu.pdfIn PDF document text
    • https://eguiders.com/uploads/3335819953.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39a990772---67956607758.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/milufuxeluza.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/suzazobawusa.pdfIn PDF document text
    • http://saint-party.com/media/file/65942252556.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/belesafegifetopufemeni.pdfIn PDF document text
    • http://abpaluso.com/upload/file/6194436209.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613839f7741f5---kesomole.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9858ec41c79bf9335fd1744fe38ede67/jefibe.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sefuwegisurolozikolukepog.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/xovak.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090507193873499.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/jexobavegobo.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/72215820335.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/36012744807.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/zozuxolef.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/zufexomidika.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161304ef30f8c6---vizuza.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9eda81a7---94305592322.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/43449440736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=telegram+apk+windowsPDF 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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10776 bytes
SHA-256: 0d0b3bd9c67d1c94b9e4a3c6729e91dc5684894b7594f51a8d3a79317b087204
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 18960 bytes
SHA-256: 66f5e62c01b41f5c02796a92cff46e26482dcb46ed7ff4485332db20550d2296

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