Malicious PDF — malware analysis report

Static analysis result for SHA-256 124cffd45a36c332…

MALICIOUS

PDF

92.1 KB Created: 2021-07-04 06:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4e03b0f5fbbe25f8cacc8647d3e655b8 SHA-1: 4e72cea6b300143c5e3703a1ab22e73a4cead3c7 SHA-256: 124cffd45a36c332b122c3286650011da6b1694002363dc2754645bc54376ce8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/36c6b1e7dc1cc48458192f9842b24259/digamijoselenamevasepune.pdf In PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/piromaruluko.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eca78c6c97390825db67a0023d0e55c7/zinapavifepiveluvubovezux.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a133ba887e9---duwabegofiki.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zinexizepoluburimarenave.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/45031368626.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a980cd2e9---93420112170.pdfIn PDF document text
    • http://108homed.com/userfiles/files/jufemoxegol.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/caa1fd255a0e474b1f7e7eab96b7b1e8/zanuxukivelutasa.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/1125128357.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qbm4h1brod3p2c74lf1fqo3e8q/28382009456.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1ea583769c16de1fe5fbe17e7cda2814/45777199236.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8347e52ee---33896903327.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6855304968---92162457413.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7defbb20c5f944755a37d52ac3f7ad6/banilokulekubufakigu.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/38198957140.pdfIn PDF document text
    • http://branchennachweis.eu/userfiles/file/beluzerux.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/58229437877.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1e69b171---tawujexasotaranonetinexal.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c75219378f0---49476831185.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/lakemide.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58310504b9---lobipusepejikozovajixasag.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/chkga4h865nreon3kaudnv2v86/11575210544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=depression+in+the+biblePDF 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_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 10328 bytes
SHA-256: dd031346a5188de03d6ce0302b82f8a6e144cc0b8269461bf19a51ee2af3956d
font_01_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 17248 bytes
SHA-256: 8534a341a3f3e9cee0b11a0741f1736c4722c6c38047a4800e9d4082f4dd3fb9
font_02_sfnt_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1