Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d7b1ed378caa2e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-26 05:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 995632f3f8328b2015c928bd15dcdf8b SHA-1: 12129aa092522134fc3d5e0ec5b2a17e05ee5405 SHA-256: a6d7b1ed378caa2ea628d19ab045c909c3d4eb3f47fb0212514dffe4d82603e8
176 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PRC/3D content is unusual for a typical document and may be used to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f4f064c---bogexebofejovoxifov.pdf In PDF document text
    • http://decorstore.eu/upload/file/76974329042.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/68904324234.pdfIn PDF document text
    • http://wych123.com/upload/files/82403307903.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/18014448795.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/75743603764.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/68725266881.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/23114144393.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7543c3bdd89056755ff0aabd908277d2/kalalegetawefeloza.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/molonodapusefa.pdfIn PDF document text
    • https://argumentua.com/i/file/35836991699.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/16157558095.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/20/xigapog.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/93350736774.pdfIn PDF document text
    • https://umartravel.com/files/82128086561.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaweta.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/67d9cb5dc3e011988d4bc78550086c32/nikerovabakaj.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e6d8738f506c093bc54024c36a0ef9f3/41481897129.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2c340d7a---30712563137.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c91a9de3922---13747817444.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611800d112454---16546150162.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/59083254142.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/734bd248b5e199c300455e48446b7442/vuvaf.pdfIn PDF document text
    • http://flgr.ru/files/files/vurudod.pdfIn PDF document text
    • http://progetec.org/userfiles/files/37184262678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cable+box+says+easPDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 17920 bytes
SHA-256: 3bbd78eec5b62b3f7876e138211daa2b3175366008e996e8dbf9f08036dbd88b
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 10092 bytes
SHA-256: 0732ac90744e8a8ffc7870a1ce8bfe31bc87d8b57329c8891d61c798f157f6b4

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