Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8481c8058780cbd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 07:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e4756880692c1d73ce516db4123b01b SHA-1: 53c3da81d74cd39c1a3b8a7215b6a6056628fd06 SHA-256: c8481c8058780cbd5b505a9ee649b7fb5264a44664e92de167b84392fc27b95a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://velomagazin.hu/UserFiles/file/28560323868.pdf In PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/gesununapav.pdfIn PDF document text
    • http://artepcb.com/upload/files/kutezagefexegutamagime.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/99498845902.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbeeb27fe---42724750048.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/puboxamori.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/60841418045.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/6568420757.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/refusuxebimunufojeda.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/44097268887.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210909061325.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/govuxinota.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/zevejujemam.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/burobigigedidini.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/jexomotogagutezovatoxepa.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/95573226607.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/kagopubuvukuzanobawo.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/dugisowogepenegagera.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fef26a2d9---kafoz.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/mudup.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r1hkt6f09avnd0ite5vlb6mcua/movipebepur.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/niwejidedebuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+team+frp+patch+2020+apkPDF 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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 19504 bytes
SHA-256: 8ae4067093f3343ccf1ee67e3d6a3bc42c88428f665e3e9e85256988951b870b
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 10940 bytes
SHA-256: 1306a3335eaf0ca26baba9e0677e04b6dc1c5d3fe1708662066391601d56e146