Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c5a8b09388dc7a…

MALICIOUS

PDF

217.1 KB Created: 2021-06-26 12:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 52e5333c13df169eae4acefe13467733 SHA-1: 309bec3ab5498c9c10ec7692b5117ce533a3415c SHA-256: d1c5a8b09388dc7a8522d86fe3cfbf5c871267ae08d8d660e6f6a7c88e88a67d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic findings indicate the presence of external URIs and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. While no scripts were directly extracted, the PDF structure and associated URLs imply it serves as a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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://aluminiosarla.com/userfiles_arla/files/jegiputexotu.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/50227220344.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/45027019475.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4d5a78a5---23883460701.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e65be7f0edc58c2922bdcf088834d1ed/lomapiwu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731490dbaaa---jidasofiwumefibixituxopem.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4ea738e6a029edcfd1089f67f6ee7273/diwuromebetonokazamabuz.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/mopedi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160711c0dbb092---rilajub.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hphf1j1dssmavq4a003prtatf1/muguxesoki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/24d1409a912bfecb5e2240474aa92e98/xovugugaragat.pdfIn PDF document text
    • https://keongracun.org/contents//files/fagitiroma.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070faab87799---jilasat.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ec787a15---35947629829.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tuduqt5d5k0pe42igqa76h1kd2/85114672446.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d252ebbba---27204333967.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/76139088243.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vl5jfc52cn0mofbck37lf199ut/37888183301.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2cf9522b---54121990772.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb394ddabe---79835876461.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kuduzogavanedonotusuxiz.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/7914275117.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4ddc52d9---95796448957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=petersen%27s+field+guide+to+cthulhu+monsters+pdfPDF 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_off0002f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F273 11040 bytes
SHA-256: 40d8fc5742e45210a0a56eb73d742fb74573539de0e84d9370e79fdcb379efea
font_01_sfnt_off00030bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000323d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323D6 18936 bytes
SHA-256: 498c09e8479eea9e60218d17d4e8456ec9b134db9dac21bb3c201b557fbcfd59

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