Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e6ec4b00e2d8c7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 02:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36939f099337049400fe957bb7ac70f6 SHA-1: f14b49bda19def2cb3a0bdc5be89fe72c6c90131 SHA-256: b4e6ec4b00e2d8c7d05554ccde6404ef322c0ddd3f7cf632ee909303b513f3ba
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'compromised CMS upload link' heuristic and a high ML score strongly suggests malicious intent, likely for phishing or malware delivery. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=offline+browser+android PDF link annotation
    • https://djecijagarderoba.me/userfiles/file/bibigepurojesal.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87559687336.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/jisowirerunebaro.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/6378336445.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/42552081560.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a3832781b---59855231729.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/xarejasifosovoxoradoraja.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/buvufawojakuw.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/zajigevekimeb.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/pixopak.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/35009242218.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a34ccb331---33139427787.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ac415ac---japobuzula.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/90729749804.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fiwepa.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vuxozaxidal.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/xukupimubunuxaroxuru.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/31078515207.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c4115720---zupewamiteribeniligogi.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/kasutamalafiwatezewone.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/jumidubofopi.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/69138821974.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/87981330879.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 22804 bytes
SHA-256: 6c45d4c62b78da2c299365724d9c5777188ab5a9cd9cbea0c3e72397ad28ba9d
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 10500 bytes
SHA-256: cabc1f73121924d7ffbf2aa3bbd5d3eeec0affb472453b9388e3e6284739c926

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