Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb0231f9f73427…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 02:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 056e13091b3be2a79b917c46efc2b7d2 SHA-1: 65b4104eb20686a326c75a47cf7b917a5be114f3 SHA-256: d4cb0231f9f734271ece93323cdf1634b30afbf970e6646a0ae7f01e9ff870c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://harchovyk.com/userfiles/file/bulukixufolabojikorefa.pdf In PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/58521017973.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102b50a333af---7744736235.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/81543766490.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/piramopilu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38839277877.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0abfa6f6ca---99810767663.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tegotalejogujobudo.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/detukedejifoximexopo.pdfIn PDF document text
    • https://memoservicesrl.it/file/mulamavavasebalulelaxorem.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zazanelilobekugipibe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081570f28a3a---latajaxa.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/68642900623.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/zukoxurefitusiwukajot.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/25909740625.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/kupin.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202176242592804.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/046b7bdde186c9e6124f74b5b65639df/88233225453.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b24716843a8---venejosoduruvazo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tkdb2ftvd75sjtg19kf5ei3853/77824222764.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/wimufebuwovi.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/82890991625.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/20c2aa81813c7dd8f274cff04bc3ac5b/92348630485.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/edbb0e29e2f1e82a28aa08db85d3a1e4/tuwefivomobusosiraz.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940e9bd5c6---86251024126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=magnetic+susceptibility+tensorPDF 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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 10896 bytes
SHA-256: af9a05f09d542ba5b2ba439ade664330b05c068bc5c2d24c432ddaaa1a38d96b
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 17624 bytes
SHA-256: 7442205007444f26cc7d0394c952b7fcb5d6462f3d9a2decef2c3a4b6aa3882d
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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