Malicious PDF — malware analysis report

Static analysis result for SHA-256 e617732c64230bdf…

MALICIOUS

PDF

80.3 KB Created: 2021-07-05 02:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: db7690e592b8d271657c69acbb9e4ba6 SHA-1: 8d46d1a08a997c1cfcba8560ef74465b6ca0edcb SHA-256: e617732c64230bdff8cdbcd9876a6c1606edbf2718a13d3952a374f6a53e8e2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly indicate malicious content, and the structure suggests it's designed to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a218e7791---55333007529.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071427a92256---danefopopi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/72616592815.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xaxabujebon.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lizewesuxutovuxiten.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9vbqu3tu01238rolqamnikn2i3/bonudeminazosidisog.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/84219181240.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tadukabojetapokiwoxibebu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ae8dpuq93vqcegd8h4gv82g71a/98004852139.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/afef910f835eef55256d21a1e95ebe21/gubekik.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/74408948862.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/watefokilogevizak.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/40049336056.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/vemilorupikaveve.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e74a40a74d0c9700f6bc4f9b92d33707/pibalojofiporetodorija.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd21f18a27---toliw.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/xovevemuvanugironuviwalo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/garagotofumikatewalopifa.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f70adab92---sebuletewip.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11494509781.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xavojubavulifedeledoder.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3aa5c9b5---85978229601.pdfIn PDF document text
    • http://yuha.be/_files/file/32224469728.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/51904094597.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sozaxuneveragoratigonerox.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f0b0b8d8ea8be8946b7c11745e5ab2c8/58816210752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=video+preview+imagePDF 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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 10440 bytes
SHA-256: f5d01c11e909e9372f4c0b6b6f6c962749850484d632aacaea20d5b92f2f3eae
font_02_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 16728 bytes
SHA-256: a3a9902feddb8c5c7a7c131274a38c962f8f104cdef6ed694bd3e0a5ee337360