Malicious PDF — malware analysis report

Static analysis result for SHA-256 01114a19c5e3f55a…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 07:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e90816982a864f1f408bf65b5e568565 SHA-1: 2269f30e7635596d317fb82688e19d8f0b19dfa5 SHA-256: 01114a19c5e3f55a8ef8920fab802b276e888e14cebdd0664e1f7d59b95c9fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rbjckbra761gfamc0508fda4ii/fuvig.pdf In PDF document text
    • http://studiomistretta.com/userfiles/files/93208144615.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kejavaxunutefi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e2a33111---zirejivodoruzozobi.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/38696106554.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/ranonafedufav.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/vunerumonibosegazumat.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/rudoginudamuxax.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/16358233395.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gejizaxota.pdfIn PDF document text
    • http://jfe.hk/userfiles/rodenewisi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab896a7f5d6---dubatip.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/40876246825.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad017c27db6---8974849471.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/20275657026.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tariwijufifutexesexasuraz.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/nusakamur.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/kopojisu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xikufijeguwekojijom.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/187234d92b96d51c16e012ddacc4f263/95609080759.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/84403336163.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f68r3q17bvtr0chk17lrb9hu4i/6951009840.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/29202353601.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bosifevezijibamaxupi.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/kojejejewixi.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/lomelolilojasiviwefarigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=integral+reduction+formula+pdfPDF 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_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 19748 bytes
SHA-256: 46cc8d1385021912b3c61c03b0267ece01832518da7dfd6fa1ba61c919f78255
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 10848 bytes
SHA-256: 4259c0f5982056e197022861ae181fa43f3b9188b3a044fc0e9d1b436799e756

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