Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52226f34fb6ac22…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 14:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6be78e15e7365563ae8358831b816103 SHA-1: 9cbdb5254cf70692495ff644b99c4e1798d3b619 SHA-256: b52226f34fb6ac22d2da28c97d9a3c98bb0b4a64ae16e516e8c40fb68a630aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dondepodemosir.com/userfiles/file/nexivuriwizoviwikonuxuz.pdf In PDF document text
    • http://geologicatoscana.eu/userfiles/files/48862044515.pdfIn PDF document text
    • https://ptogel1.com/contents/files/77048798063.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a95a5b92a---rananakobem.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/mekixubijuxemugabupunaje.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/fibugelojagulo.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zekozavu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8084c222---45447473890.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107546b765---11498381805.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/68300981051.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/74511858311.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42326894937.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/pizemexe.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/72967774918.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/xusulorilitel.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/87821906860.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6071tpiee4rdm83s2107ra4t0b/31415222716.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/46150745221.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u65s8vsvfebrlmquqo2au7hnm6/65266589601.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_F745A97218366461.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/lurugiradogazojofaniz.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614627dbb07dd---97683432275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+legend+of+zelda+the+minish+cap+gba+rom+downloadPDF 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_off0000c359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 11316 bytes
SHA-256: a308ae4cd19eb1330adbc5b36c6d76703856f8dfe4a7497c5510c1f0eab81191
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16592 bytes
SHA-256: 1e838b6edaa44b1538058887002533ff4f381b0eef455b2efac63882ef15a273
font_02_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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