Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bb8395da20d4e6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 18:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0f3c68c2c77586a7e01ea13b8b6ea81 SHA-1: 60236b823fd55cb4015b4b7ebcf926881cb6a294 SHA-256: 32bb8395da20d4e684da16c38e2a966ed7e594953d847bd458f6f4da7d0a0072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8c4328a590f3306633b4824ca53c5d5/vubinapapitoxaf.pdf In PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/filarumimikimewitinepe.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/47359822840.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c833537fd362a092662c1c58560e7a18/95288721183.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/5282736280.pdfIn PDF document text
    • https://esz.jp/img/editor/files/85161744577.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kubidinulirofimezinis.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/nepemol.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c76114065---bitoletixub.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/25042841505.pdfIn PDF document text
    • http://philipsphotographystudio.com/53798926065.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/49514081494.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/meretoboderotexo.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/kijitet.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/jamepuzupidu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/kodafa.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/gapipewotozetanepezeve.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613364120f789---95730529713.pdfIn PDF document text
    • https://0900107678.com/upload/file/25819889728.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5ec8affb---suzevoxikirafinuvoko.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631066956.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tasirebetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+graphics+android+games+2020+onlinePDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 11256 bytes
SHA-256: 56931991045ce1001caa3e3a8f034b79cea3cb4a3c90e6f45215459239998481
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16272 bytes
SHA-256: 26a5e8fc92b0142c208b54b8929e98c1721a009a243397163c0a40774f6a4d83
font_02_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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