Malicious PDF — malware analysis report

Static analysis result for SHA-256 17504d54a6f92dcb…

MALICIOUS

PDF

105.5 KB Created: 2021-09-03 08:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6fa4fb598cceee5bfa91bfccfb248fb SHA-1: 627d14e7f668e17d1fcf7e1514653bff1c90213a SHA-256: 17504d54a6f92dcb0b5e106e395cae4c151646ac5e0f8f8dacc6d335cef74650
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://georgewongdesign.com/gwd/upload/files/kitubidowujaxixel.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098d28f29643---23425497071.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/saxozalefovisuwukuwide.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lajeruraxolamexeketow.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/kuruditubagoko.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1ef14e1e---mobof.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/56055509759.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c44ad2c429da41da5003be71b6547e9/dolajalitij.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/21e94ec427a52b115216a78dc1bfa881/nepirajile.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d5ba27009866940bb70028c712b27c90/wurokov.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/74012297652.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/rexivavopavaponopevebo.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/b99af9a3edd926f6a75d79894b963cc4/pomiburotufusilaxuj.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/56201999167.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/80eeb14b8bd71d82ad93ae85d1cc869c/13051921698.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/bifaledusuxupefiruru.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sn2kb5rne3245qad1o392qbgqa/46252395814.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/76159617857.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad9e6510d9c09e003b13a8e347c3b640/97517775717.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/getafuvuzekajaremex.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/98148068478.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tawepefuduzawatibowano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=songbirds+phonics+worksheetsPDF 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_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 22032 bytes
SHA-256: 1eb0e6946ba75179b29262d4c929aaff035f0d4f5875c6c913536545d9bc6c14
font_02_sfnt_off00017f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8A 10980 bytes
SHA-256: 82fe170b2f19f258edfb6bcd0f792842dc4f61ee83bbb9af05189263b391c60f

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