Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfe4a1c38612e81…

MALICIOUS

PDF

101.0 KB Created: 2021-07-04 21:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 99fe92f7a39f6eb6ccc1cd50d46705f1 SHA-1: 9d8589160e16db6c8d8ffdfd7b50de19d2cebd52 SHA-256: 8cfe4a1c38612e814e13cebe7a8f216d312effda3421e785f4dab05b7d8048a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs and a link farm on compromised WordPress uploads. The ClamAV detection and ML classifier strongly suggest this is a malicious PDF, likely used for phishing or to download further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bellsazshihtzu.com/clients/878694/File/71926828810.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d1063000---tugufon.pdfIn PDF document text
    • https://actorconseil.com/files/file/wavironodojugew.pdfIn PDF document text
    • https://bauarch.bg/files/netovelarobef.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhtkojavpmc2qoo284j30hs8e7/zapijukimogutuxafirezom.pdfIn PDF document text
    • https://dpmceramiche.it/file/zabareboponoxopefi.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f57b978e64eec00b5cf7d532feb0b695/gibukalurafupim.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0metv44njolbj1f63d4o4hooq/22862296605.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/zagibubipexuxomuvuze.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a776cc2---furojazezesegejilalabuw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098417fb2a9e---merupiviluruwomupagepoj.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/79102991241.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xulodirivolegisuvijakejod.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tetunofikutotipejasu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/9he624bdek2rffqt8fu0081mor/radikanozizatexolumuwig.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/6252053713.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c568105843---vuvurivonuxijozudivanijo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bgufi52pgl9m3q5read9p9pfuo/72687368815.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b21215de8fcc9344b310072b33970d80/17727291509.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845d8434292---nofefaxafujaxazineliwo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e2e92eb3b6025e38e8c9fe8c8f353ee7/10882658017.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e39d44517cedf5982221fa3f89edf839/kowenutulizomoz.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/pr0hjhi3bm8abd9ehrpbgn5t2d/76730715691.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/vlgq2db6jaakgls50afuifj7qg/44218994895.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ns3bqpt775tr3005r2qifd0sot/67129692348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+the+radio+in+untitled+goose+gamePDF 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_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10872 bytes
SHA-256: 92d7e76c401593518b1f62efbff8b87a6c0965d3f883b377123001fe56e14156
font_01_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 28824 bytes
SHA-256: d8c0575b17e9d286bde8f69d9f4185dc1c7db789ae3b0ae643a7a2f32c0cd6da

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