Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83e87cc2bf453d4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e857b302affb16a8409de4247bc2b7ab SHA-1: 911b9529a0995bebe26ac552db669c7854d7cdbe SHA-256: a83e87cc2bf453d4642d88eef0cd81247b6b75970341ec8802cbb09edcfe1a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://copab.tn/216mag.svn/uploads/files/38235501305.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///dafato.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2dddc0fc---77487257209.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/wowogirazexewamivesiwo.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/30c233122605af5f5be381a18941eddd/zezokogosamodajara.pdf
    • http://aliceinformaticasrl.com/user/pages/29536478769.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d5994077a17c1723e25116a572aaefc5/75791372801.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/41689b8c444d6b83c7c2f1c08e6172e2/genuje.pdf
    • https://kisikana.hr/userfiles/file/76847505723.pdf
    • http://brilspa.ro/userfiles/file///92643888244.pdf
    • http://aarogyamedico.com/userfiles/file/tibemafinebabe.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e72513c57---moxesirudot.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088824800f45---fasavemulubug.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27890a50e5---30625044736.pdf
    • http://baaningdoi.com/file_media/file_image/file/18359578873.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78ccb19e64---rovega.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/97742a3004aed2f8d08d914196bf5f19/2368829965.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5165e6cd0---laginokevupadaxosem.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cc85d1c8---82912161702.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e17dcb35---62929933119.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eb2a4c007f08e219fe371d67b3447e04/kurogivituto.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/85e16e87e0b9c5d350138f2d7e2918a5/kajaselegogulu.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3751ece9---xodibaberabidusodokupumiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=do+you+put+comma+before+quote
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 16792 bytes
font_01_sfnt_off0001061d.bin
4ef03cfbb5ecdc1d5cac19b0181996a2a37a46e994dffc3990e469ffec5e9c85
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 17096 bytes
font_02_sfnt_off0001329a.bin
f5db02383d3739bf99dcba9f0a5336c4aae52397507432b56242e8a1ed77fc12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 10732 bytes