Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e1372e683087bf…

MALICIOUS

PDF

128.5 KB Created: 2021-08-17 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fc26c42cf5ff1ebea52626836c4dc19 SHA-1: edb8732d09ad30950daa2ac363c3cab528a0c951 SHA-256: c8e1372e683087bfc35b1e5366fdbffdb4deaa38129ec449281614deb9b8e01d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This, combined with numerous embedded URLs pointing to potentially compromised sites, indicates a phishing or malware distribution attempt. No scripts were extracted, limiting further analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c0827d4cec19ea9247ea3acf6d99858e/duxesonajatufusosanuz.pdf In PDF document text
    • http://biplano.eu/userfiles/files/29983932051.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949828c559f---16483187817.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/girutufudisetowikora.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gaman.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xefizariwozusufatevemu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f539762f---70124720304.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/linonosevebibunulufov.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16795690d---75201936449.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107291400369013.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607081a62e0c4---24549797629.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kubawuzen.pdfIn PDF document text
    • https://petek.biz/resimler/files/fifof.pdfIn PDF document text
    • https://dm288.rs/slicice/file/poxutinozawapotolom.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0a03481f2c4bec0d6359265c66f925fd/xapimez.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0vp4iktp6je0ca0jjvumd9mcta/muxinedetovobogobut.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/figigi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099c223e2480---85013484756.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8038cdf94b---terosowedeb.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/31202922547.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ddc00101f0e65b22b215e65963c83547/gokupovamobiwi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b9da1d7389e42bff33a2a17a0c0bd7c/53110830893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+fire+red+randomizer+download+gba+romPDF 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_off0001907c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1907C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88E 18924 bytes
SHA-256: 849139af8a5a0ba840fcb330c3f5095119c0ae3282c259ac60ac2859e162eccf
font_02_sfnt_off0001da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA6A 10812 bytes
SHA-256: e425359e9c9aa29e6df4242aa0410e50d9ac83d32d322b15dd5840dc96f517a3

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