Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3018c2dff9b1c…

MALICIOUS

PDF

92.9 KB Created: 2021-09-04 06:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0afeb3864e64e88890f55759bcf8a948 SHA-1: 891e719a04981ac337a7ebbe8db7e0b1ca4439df SHA-256: 4fc3018c2dff9b1cee9efa19802b1870a000930ef2760a094d45f8ca1688d109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://krisoc.ru/uplcv?utm_term=eberron+5e+pdf PDF link annotation
    • http://gillsandgeckos.com/userfiles/file/kawufomivowofe.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/33890545613.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/banep.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/71446787667.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a019e64625f---nubeluzejezafunajonoja.pdfIn PDF document text
    • https://olterus.org/contents/files/61043029622.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d79e21b7---78425266449.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/84409144639.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/besasonufok.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/terokoja.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/34152694760.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ce482a7---42686180282.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0db867b0fbabfb59275b61468692f73c/gejime.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/57257295f20454d9ca82bb52299e05e4/5723042872.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106797269671---44876175933.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kojusam.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8be010a95b---77087149907.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ae87598095cfe54773316d1c9996309e/52916629613.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/87759248389.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/mabuzefefokubasujiwuxav.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/95b9edb35e75036c6222f84579a1c734/vezutukemokapemevad.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/19784000526.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e8825371826ba9b289932642e720eb65/81048287219.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/72190361925.pdfIn PDF document text
    • http://mfahk.com/upload/files/72312944453.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210708_8AF2930A33D00451.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lcp0sabpkf1hft6n3p0p4680v5/xifarobajoleme.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10184 bytes
SHA-256: 2418add0dcc22ff9ebda81c89678d3369ecfd8253ad0e3515f0065b4a2fa6f77
font_02_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 18204 bytes
SHA-256: ba9404464f2bc262e79e5eae591ad1684a1c0176d3c47afed10fadad8ed8ac54

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