Malicious PDF — malware analysis report

Static analysis result for SHA-256 0151f012123f7999…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 21:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d93b2b4eb483a1f94519ba37c073a9e6 SHA-1: 11d7df24e0f5a7d9b1826e5adbf2d7422471d0b8 SHA-256: 0151f012123f79991097cff50f8993c3adda31a080b0dfd5fbd28fcdcbf4980c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=how+to+turn+on+hotspot+in+android PDF link annotation
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1002b6a64---katezakabakijeduwuzixarup.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/ritix.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/pepidepipalalobagovena.pdfIn PDF document text
    • http://neteyes.eu/editor_up/riwavetujipinajaled.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210911_115054.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138706a04fed---57976962853.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/50805942748.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ed5b7714---tibegepujujupisurenusimad.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/77382719391.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40390361172.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/woludepin.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/11257758937.pdfIn PDF document text
    • http://woykoff.hu/upload/file/59210175879.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109012256411566.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22ede5ea---zoben.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xilitorizonirufulagimapiw.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/emmhlv51u6ttm3vtivv569iia2/romumuk.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94291034130.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tobujirivarorovuta.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/58448049007.pdfIn PDF document text
    • https://aayams.com/userfiles/file/22589853395.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/66531589580.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/29180819795.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060928585908.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/wowixatepizavuda.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 16984 bytes
SHA-256: 61091d5635183e2da8057dab18552cbdfa7b026627970513cb4aff1a3542f487
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 10488 bytes
SHA-256: 26c6728e5723df74effab8b5920189059e16ba1c66d6d87f8d7f56e545eb0510
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1