Malicious PDF — malware analysis report

Static analysis result for SHA-256 e102164cd11853bf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 442429a3b903fb398249a97742f80b2f SHA-1: 365752ffabcf1026ac44ff2fdb4f65bcd7d2f155 SHA-256: e102164cd11853bfbded97da3d001aeee3cb4b446099ce48cc3d4506e42da26d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which appear to be hosted on disposable domains or utilize WordPress form upload vulnerabilities. The primary function seems to be directing users to these compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=esl+preschool+family+worksheets PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e63f6851b---zutusepil.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18033fa2d---kexavi.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/gadivalegirodusaneke.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a00f157ac97eb681d9f9a63e4e1a5477/dezinuzufatetemo.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789ea695f---gajitezidawukeximob.pdfIn PDF document text
    • http://k1a.ru/images/files/file/bakewotofel.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/77030202593.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/53269483846.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/at5i1d1tt5tvpuij7km45l9onk/rokapizukulut.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/potonerupav.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/dakunotitub.pdfIn PDF document text
    • http://officia.tn/file/luvozevopixisakikisesaf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bab170130---kidinusav.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/powim.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b35d58a32---nuzonubokewatelivawasoj.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c038983d3---11506789698.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/91260866825.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/61241554923.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/24453183278.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/532ad93e22076d3160da2540cb378691/29317590854.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/78779993188.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/90836799280.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a891f56466bbc7657990e7b49c47eeb9/63184235787.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/24157827410.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/miwafijorasibero.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7jmmc92i6bbq2hm6kn3jqnbl76/29406609166.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dakolalenawatiwilobagipox.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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 17964 bytes
SHA-256: 843bba7e0440efa319877651591af52b7ba5e02c8a712e73fc86b7f0333d2556
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 10916 bytes
SHA-256: d5e1bf6f064de97c39759e3a9b6dc0356243c272cc489d37f2ac584f735af549
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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