Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2cf489f51322a3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 04:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 718e6a89003f3e72108606c6aa4cbcdf SHA-1: ecf725ef96ab14aaf06c820015ca38806781feb4 SHA-256: fc2cf489f51322a33f3e6404ac122ac766c3ac1a73fd1adebd076b1f1cb338e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to obscure the true destination. The presence of embedded JavaScript, flagged by heuristics, further indicates malicious intent, likely for redirection or exploitation. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batazosamogam.pdf In PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/69603894831.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/82170142328.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/93066746373.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/77641807421.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/10669345243.pdfIn PDF document text
    • http://technocom.pl/editor/file/tuxir.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/90189398934.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd4255bbf---17336478219.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/pesatodawi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/panabufalurag.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/20760944273.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210921055011885.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ef535e49---jugowoj.pdfIn PDF document text
    • http://mlight.cz/archiv/file/23924797849.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a393d3711---37872465133.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/juvolas.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/44283291293.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/61295048032.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zurovam.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138267a044d2---52261025461.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/jexatawunadi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/70662958279.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c0dbb98---valuri.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210919_A4AD5AED1DA14BA0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pro+pool+2020+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/basekoloseparikabunog.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a25a5732d---66893175577.pdfIn PDF document text
    • 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
font_00_sfnt_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 18432 bytes
SHA-256: a851707a82cab7c7d398056607240c2ae35172c4d0e9afbf2215b6c4df7c3cc0
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 18616 bytes
SHA-256: c647a64af8a8a05d80378803aa2069e477129998fcf919dc90bd076dab05a9d0
font_03_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 9984 bytes
SHA-256: 9cf4ca19b83e87525f2aed5f39b10cd4e9f457862b13e706bf0cfae45fb03e28