Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c2544dd0803a8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 21:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d87cd6f45957674e5757674dedbe99bb SHA-1: c7c28172a03aa77a7965729fb17bbf78b2afa824 SHA-256: 3e8c2544dd0803a8f84380f021f4d7471483cf330dbecccf1820475538761469
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. It functions as a link farm, directing users to multiple compromised websites that host further malicious content, as evidenced by the numerous unknown reputation URLs. The PDF structure itself is also suspicious, with duplicate object definitions and a high number of external URI references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://abwingssuffolk1.com/uploads/files/xugora.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125777e9c3---taperutakaxixosaroxufis.pdfIn PDF document text
    • http://lawngo.net/fckfiles/jivifupufalizujafo.pdfIn PDF document text
    • https://bem-sa.com/img/file/lemasune.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/84983701769.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210620010208.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceec62de4d---gudepo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/27361510918.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/701cae29981ed5d450ac9bcba8ba4760/panurasonigufaniwabab.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53606461136.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ee100322e510e0f34b3ac089b58686db/62552337058.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jafokuler.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/wumeken.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/xunejonuzazus.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/finogujidafozi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/554404fac64e67b50afe98fc271ad7a2/varoloviwurudes.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/27303227394.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/buluxikebobe.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109071027316751.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a1c86c3d---powejuwomuwuziteke.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lijafenafakuzagi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3d39dcbd972615332562514bbeb84622/33742714796.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/10f09303c1befded2d14f045f302001c/vakirov.pdfIn PDF document text
    • http://rld-carbon.ru/file/53678582953.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c7715921a97180f1136c08fb837aa8f5/69544784468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+reading+level+test+pdfPDF 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_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 16804 bytes
SHA-256: f92867727a69d324f1e2930f028418fac4356d606ff9df5a1b9ae01ad18db554
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10704 bytes
SHA-256: 7bb79859488fc65c6efaf96d2e60eacfa59fa51fac3394b92ae256fd5641a773

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