Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcd8620b196460a…

MALICIOUS

PDF

82.3 KB Created: 2021-08-29 17:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5edadf8a951297fe271a0aafc17cd64a SHA-1: 10450b16584fd15c588f27e8a7b1283e559524ec SHA-256: 1fcd8620b196460aea38b3b61ca1bfe9d1cdeb3ebbd2a5622cf48348f2efa512
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this scheme to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921eb86932---63127643272.pdf In PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/nubomebipazitabikase.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e9eaaa7---33903637911.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161151ad7174bc---82382612402.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/16257003333.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/83619520053.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/92938988451.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac20648f4e---bavedatisujefir.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ba6587ae79772be1bcae99655ef93f98/87822609327.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/paveribotejilovori.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f8bbdc5f---raliwalubokuraguzinadal.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210627055436245710126.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/duwujemona.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/chifhd78jq8852h02m5i9e7fmj/balokewakar.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c134c25d2e4---43420087230.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210812_47F2E511122459FE.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/durezazejixipekoju.pdfIn PDF document text
    • http://ty-int.com/files/files/28417578690.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zasaxakiverelapujavusefiz.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/53937009326.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/67712063296.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4ed5ac46c7b70a5e2ed74c2bdd4568b3/90119983045.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b61dc04ac6---xezogoduzanoninujapajid.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/2975140002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=project+on+central+problems+of+an+economyPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 10936 bytes
SHA-256: cf7dc7dee85f2be442a275d00cd0ecd628602aaff5eeed4939ccab418d8a5a75
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 17988 bytes
SHA-256: 64593889d40785d4cf6925f1e4c8b4db2a432ec6a362a991aa73590fd1b5c3f3

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