Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1d9606b5dee550…

MALICIOUS

PDF

89.6 KB Created: 2021-07-22 09:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2af56f3daf393ab4958cf88cc2886741 SHA-1: 1870f07c912cf42ec26a90594279f423f2c34eeb SHA-256: 1a1d9606b5dee550e4a7419fa99db31cdc58b22eebb25095c831bd82c9f08d21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the heuristic firings suggest the document's primary function is to leverage external links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aldurra.ly/images-editeur/img/file/robixibizufafap.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710eb17fd1f---pajopuvepivutuzivizaraf.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd873af6f---59584060222.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/ladizozofuderubedinaje.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/osavm42rrg800481c29sb2907d/zowixan.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/398897e4fb037d7d369b6806b634a74e/56268924813.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/zemagifetifezekijo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a3ed6ccc---werubuxifavudadovox.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941161e0a7d---baxalisodubuw.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7cb7104d---zusoxamejoz.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/nojudawufejowumafor.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/91874270117.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/jolejofi.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/wibulurowimegifudokak.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/li9r9li6ca41jm75ro1lfgoqc3/36825578663.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/311407775.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/42aeaa341a0560a9520bdf00ddadaa55/lutopegumemiwulune.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/i9r7339e317fo7m86b8d47q6nf/voxifokokosatoguvevel.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/42583830721.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/gipajawurebenudu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/3566443224.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/90043404439.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/3913798961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=phonetics+transcription+exercises+with+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00013e69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E69 16944 bytes
SHA-256: 089d318fcbecca02c3d050d19ae61800b06f1ebbd4ad79792402fda90ddb8a60
font_00_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10860 bytes
SHA-256: c1f95ba88a891e1ad3cefcd52986f0340c60ee4a93e4bbe8125258383c700665
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 18272 bytes
SHA-256: b0548ea23c65c64b6cefed1da981e7e662824823280b3e7c1d568e4feae43189

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