Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b392d43172b5f1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 22:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1014d44ff3cd6a42c2487105ded08f5f SHA-1: b510a9171d946cae0d7840d950c415c6beff19ca SHA-256: d0b392d43172b5f1cfa758cdd428c36af424673902ada681ab628d6fa4175bfb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=minecraft+1+16+221+apk PDF link annotation
    • https://anthonygillant.com/userfiles/file/54827683942.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/15409835431.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109060701115938.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/gulinizutig.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf3adba62---kobalobifiwozosewup.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10e97ed3---2377419313.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///43071867731.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/20472833419.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210907_416338756250F2AE.pdfIn PDF document text
    • http://krzeptowski.pl/file/marajidevobido.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/14954140878.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77054535435.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vosasebit.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xoruvumijuledatotuxin.pdfIn PDF document text
    • http://coachhouse.info/assets/file/31036216559.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/surupomebi.pdfIn PDF document text
    • http://guitarenko.fr/img/files/54311669019.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67122701355.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/43719700984.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b44e15b3---pizijadoxujelirudoga.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/88233717774.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/20285004998.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 18104 bytes
SHA-256: 9921eb2a94cba91421a7c0e3b3de3763e13190cc963c3b90c07d493aa6b7ddbb
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 10564 bytes
SHA-256: db56199e6c391ef1f52c2f8884719d146f541c2a1b8250553ebda80d2ed827a2