Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fec1151bc37af1c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 11:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d85784ef06809551aa6eac82eb7dc22 SHA-1: 54d2a5f2948d76e537f09c3b8c5644b96216ec66 SHA-256: 9fec1151bc37af1c79fffe3bffb8269ad42aea9c8d78eb8871bd77a41a603869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://inwebjor.ru/uplcv?utm_term=tom+and+jerry+upcoming+movie PDF link annotation
    • https://rheinfurth.de/userfiles/file/69941804338.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xuvonixelikavixizibu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/inideranusimuzagufed.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/30754864243.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/61225368972.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/vumekafulovexadejemut.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/10282074034.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109190333371064.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c98675a58---94616521829.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/pomupi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f91c66ca8e120cd83cfceda6c77f555e/pimafuridobumazubizisifo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/87862848756.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/38526270583.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/80072755700.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/wutedufizibonu.pdfIn PDF document text
    • http://dztechfin.com/upload/file///84320138730.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/53533455580.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/27630413978.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109061953287003.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83189628147.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/735bc7616643b50ffbcd01a0c6a0ae71/pofavameponawop.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50018220863.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sebonidusidi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/14226847316.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/sitapedapuvi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/2167527758.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/78344442753.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 10920 bytes
SHA-256: 3af04cc7f12c371965ff667d8e3787e74fc1c0b26fbc7d7f1b203f080db3cf11
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 18820 bytes
SHA-256: d44c79b8796510ce10544e937655e383d660325d6ea0fa5556e0d509b88d3e7e

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