Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b56f413f4d8a8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 03:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ece0f74ee7dce69e4cfdb8a8e261aa0 SHA-1: 398c70a8c989f690b366f6d0a640a3273c13d6a0 SHA-256: 8e7b56f413f4d8a8ba080a77e5bb1392ec5f63cf97f086f83fec6a3927b0d8d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=diamond+dash+mod+apk PDF link annotation
    • http://doxetrilinh.com/media/ftp/file/2767384738.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79436873725.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/diluxavetijizorudaziwuvu.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31455360873.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/98658793533.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/10770160962.pdfIn PDF document text
    • http://skncn.com/u/files/kabawupejik.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa29495035---baxibowiru.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/51531952802.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9508cf3b38d0f8451d0deb9d2287ec5f/midosadu.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/32531409992.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161388b96dc848---vijuwi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/96460264818.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/95209219241.pdfIn PDF document text
    • https://nevisnews.com/userfiles/75967738770.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bagasizunelinefew.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nutuzujogose.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/durixugafato.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed11282dc7---rijuwibitelulenafufo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/xokenutudefukuxerowiwoji.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/52903516571.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/tetibet.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/28883880078.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 10372 bytes
SHA-256: cc58173f614936c27ceb896464c7f67aa4cd0f5d24982f796773ac633ab02e2d
font_01_sfnt_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 15388 bytes
SHA-256: 04fa1a4fdf5de5d5d8d1c2f552a62a3b8d951897140b9f7e2a53e6a4eb95c319
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1