Malicious PDF — malware analysis report

Static analysis result for SHA-256 188ea4bb94da5948…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 20:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0e4f1bd57fc40b2287300bcf8e35a23 SHA-1: 343fb9f9f281ac07f5d9153712fd3e83b57b92b5 SHA-256: 188ea4bb94da5948044ca5dffe6d959fec2b960a9bad35f5fd92230276fda4c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=colonial+houses+williamsburg PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4e332aa13792051f9b96be5aae52c4e0/3816015248.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6f0c6855776aab010d7e0ba44f68c385/dezefezuboruviboba.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052111092964.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sadarewonokelul.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b71a8093---29506090003.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/c0eaj3ib7obocollmotu3nst4p/89012662418.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8893f1e98d---ledetobo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/murudisazazalapabin.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8u2gnr2j3qkj08c4a9cnp51e61/63272213437.pdfIn PDF document text
    • http://pcstaiwan.com/ckfinder/userfiles/files/53935070313.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/pokojoxawawajijoj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156b108e14---60128345748.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/libokuvilaromulet.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xegoxabowuwugotesa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f933434616b189356465f71289c3ec00/tupefapububumevegovupuxas.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/31fue70llcbntr85n7ha8pedjp/87442626567.pdfIn PDF document text
    • http://amdind.com/userfiles/file/sutodigexut.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/67216563744.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/17e74d9641a66b8864b868c4ea8eb6c2/xemerovulopexo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/8683536695.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078309b46ca1---18183920382.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/472882723.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2e90ac214---11638989793.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10812 bytes
SHA-256: 43aa33de0f1e241fe5cfa973f762a6e79088ef2e659c64412e0f6a4a26f9b0fc
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16948 bytes
SHA-256: ac40cce3f8d5fc95bb1a33ced85d1b165513eb42bd419ef814c31764522f9dd3

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