Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3af661c4619e02…

MALICIOUS

PDF

79.7 KB Created: 2021-08-30 14:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 111c57d3b3ac7b52d8359580992e8914 SHA-1: a6844b9e09cb834173a4cc64c48b3de62f28e494 SHA-256: 2b3af661c4619e0276c934435db5b968df8aeda767de9cef884c0964dd2f7604
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=best+answer+to+what+motivates+you PDF link annotation
    • https://tomorrowhubs.com/upload/users/files/gusovegevejakirigazoxuxed.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/30188422529.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fc5f47f40979aa40f0353c6e0dedaa2b/sirusijulinulalovejeneji.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oa09u8o97big6kbvddodedc1fp/nufolixutamazeji.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xamiseburid.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128e12c07dd1---84155970387.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/30658edfd71e093f04b80bfb472f49ad/55480910276.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/51282510819.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/14245128466.pdfIn PDF document text
    • https://schmitz.cz/res/file/zefivazataku.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/90415332731.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60db093e---68120906905.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/899daa8e420f52e7057841688b173c91/20736110272.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/46205275664.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3fb854dde---13964951812.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/woganubetujozifom.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a274cd55074---rafewemifowemozuve.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/teribusudoxekovogis.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///43973411579.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e22b760d2---midoxovofip.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/wifowarezejodowatofodosuj.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6028910663baff0d8eec31aeabce4bdc/43621963732.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610752a44a1c6---70765787545.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd30vdkfkgp7rn4g3jhah0vlak/62877047518.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55469cc3d0---zifobejilemuwemozo.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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 17468 bytes
SHA-256: bfefb8e202cacecfd1318df0030b09ea6b623028720f6696a840140c8de4ebd6
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10744 bytes
SHA-256: 49e62c3913a51fce99a6ef532ee786f8f3dd35178ddf5f928a118217070272ff
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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