Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dae20bc9b3d832…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a062d23c7cf6d5359631fe0315ba3d8c SHA-1: 42b4d558d50c24014bc29fdcab383f78f9b7a3e6 SHA-256: b5dae20bc9b3d832c209720d4b473d94b9e0db4690127ba13ece1b05f84260c2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=equity+shares+example PDF link annotation
    • http://recviem.ru/img/upload/47475942499.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tepawukibes.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/279ced279b3bac6f70511d8e8867ca22/59443727629.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa895bbf8---sukewabumiliz.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/38504412482.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/k07r54r1oh61uh2jhgbk1hri30/zubuwaxunexatewakodoz.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pamitanetevu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/suzufugerakajomona.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rifovepovipa.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///wukune.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/rawejadalizogexasaxej.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/guwasexa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fa93b69e8c6f8ba54514742a18d66181/rowuwatumujog.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44874323749.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/125416768160bf07f31c20d.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dozeneranatok.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/3948249435.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b47ca8cbb---pazurikulosis.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/dabokef.pdfIn PDF document text
    • https://kartplast.com/resimler/files/wepibikonekexemifo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gsoeijgva5ls30a393s6f0b985/16978809136.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/zepivepipub.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 18076 bytes
SHA-256: 797c621e0295cb6d62a6d16a06665c9e8042a16160e31aca5eeb45ad67bc7ec9
font_01_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 10736 bytes
SHA-256: 837338a6925f0cf64e2ab98c7189070f445d4a7536a052188d13a7efc7610939
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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