Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bdf71760510a86…

MALICIOUS

PDF

101.4 KB Created: 2021-07-26 03:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce7f8040d422fa8f6f9843c4c81fb427 SHA-1: 1cf73dd9cf68771eba845144735ade8327b5e53b SHA-256: 14bdf71760510a86bed86401c9b7df216fd4191f68f04d6274a3bc5c6f23c8e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and the URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://sparan-art.ru/ckfinder/userfiles/files/5739147115.pdf
    • https://digireg.dk/upload/vovobipu.pdf
    • http://worthingtonpark101.com/userimages/2905644756.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4244e1f7869b84177413f27dd88807b6/janug.pdf
    • http://decaiyun.com/upload/file/210626104545793164kgkgexspmyoc.pdf
    • http://tencanpowder.com/d/files/48850345242.pdf
    • https://jdlpartnerss.com/userfiles/file/55741319568.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/89086325634.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc85c71e12f---74768179374.pdf
    • http://optykglowacki.pl/obrazki/files/vamuvilizijirejido.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c893ec02e5---42068819691.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fb091ae6c2987406246a1c7bcd11f3cf/wukijezefukakodef.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4cd6270e56edbaecbe8800fee5fb1207/puwozoxuwarumilodigagep.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9initfhm44iqsqslscq1b9cvh4/fibuz.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5d10547d---95647524006.pdf
    • http://bmsorganica.com/userfiles/file/kowenunajelajodiwuromuju.pdf
    • http://strandedtattoo.net/file/10354075232.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df1fbe23e---tuwaposuvax.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3697290bc---19682793628.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bolozu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87194bcec---suzebabivolufij.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/32f7a0cb6d58686d9180d533ed822c95/99711150028.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ik8890kld6hdbdpnmm9fu9euh9/dotuko.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7042a004fd8c36ce06df4d58ffdb9cb1/24717663028.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d727e7a7---vezosetowigatikuvikijerod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=knowledge+matters+budgeting+and+saving+sim+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
font_01_sfnt_off00013ee6.bin
60192d1be94904e235ff3cd71810f68fcbe9861d22e5ed9532b0c60dfa8756e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE6 10972 bytes
font_02_sfnt_off00015829.bin
912a9561d94826ec9eba125465188945c4a96206c6325017d2b569b9e22a37a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15829 17560 bytes