Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65f882606b06b47…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90c1efbd0e3057b5091bf03853baadd3 SHA-1: 0c1d21860c5c5cae42dfa3230800f1b39d548f2a SHA-256: d65f882606b06b4729ca35d9e77b867a60b7dd6e159d342354efe3d72f1f104c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. This suggests the document is designed to lure users to malicious or compromised sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://symbioticlifetech.org/attfile/fckimg/file///2021090852657_1038316015.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328767720fd---xolemexuxatoxitadak.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/40285019919.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/fotapevuzeku.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb00ca4407---89037248108.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/vojofori.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/vewanumifijesamumelupo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5c4e0316---90163233069.pdfIn PDF document text
    • https://yifff.se/userfiles/file/vaxekofopazikufojokenerit.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bopabi.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/mokufirobuparezetuva.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/83845055970.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/67211189600.pdfIn PDF document text
    • https://somogyplusz.hu/files/48637219067.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/36733438262.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/nemexixetimowe.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/2600140473.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wekijuwavusi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/32456928602.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/puvefapas.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/fetemi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/31692800169.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/23979356249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+perfect+boss+2013PDF 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_off0000b13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 10740 bytes
SHA-256: 1e7fcacded121017cfa4dba83ded44c417ba07c366dff4f9b2416f4f6664450a
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 14852 bytes
SHA-256: 9e63e23e8006708c58b6d4315521a1dab29f5a4233051223633f3877e50c466e