Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e4d7110cde01c9…

MALICIOUS

PDF

93.6 KB Created: 2021-08-09 20:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15d43ae3ef9d3df559d447e7fca366e8 SHA-1: 80fed49c6c4d3c05b854d0e9fe1dfe42fdbbe449 SHA-256: 64e4d7110cde01c9c385af675ea5e06c2525b80c8b8b55a74466f9719abcfb19
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and execute a secondary payload. The document contains numerous links to potentially compromised WordPress sites, suggesting a link farm or distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607418441bb71---55431685110.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vivikokule.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/tixikanijutagalobigetirew.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/17be4fa6f571bb790d0af961eb92fd75/gopiximaluzuvefokodapobi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e57cde8443a---nurevokimekitoruwawabemot.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079b59c02961---35508310488.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/l2na1l5svoalgpdi3g50b88gnb/vozotexugutiped.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/44539225324.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/keq5l6j8f43iu2qk9bp1u5jng2/81197074625.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ec72ed2c7b52f60abb92512984605027/59161363018.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/gasifikaxowar.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/12897488867.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0382a2177---15717847756.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/66362129269.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3476ef5db4a8d6ee011e26849e18f77a/35508257511.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/94608540217.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c3671d8d---10170910515.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210618012334_sgxh2a.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac65994a0---rokasutuporober.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1514930024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=why+is+csgo+freezingPDF 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_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 18316 bytes
SHA-256: 41b61879e1ed33fb2766fceb9f492b6d6277f5d9e0dd53c0f01da80a60800701
font_01_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 10476 bytes
SHA-256: 4825feef8697f6f5008a491a8d87d97921f8f0388325c69baa9825eb6af78d53

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