Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f3e237839ff554…

MALICIOUS

PDF

79.6 KB Created: 2021-07-03 03:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf09e0d2fb0ecfb8f51193b09a577c8e SHA-1: 152cecf65e11ace645d21f4555e9a489d3bb58f7 SHA-256: e5f3e237839ff554ff4648e4881c5e33a4653b63245b508372f182d8a99d5bde
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be redirecting users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://majubesar.info/contents//files/12537305754.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ijmfbt7rkeqfb19kul6ncfh177/watuxugajuxomik.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/44t2322g7eqmg33tsj3n6iae1g/30049823119.pdfIn PDF document text
    • https://arerp.kr/data/file///vewewakigaxevowuzula.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/64885146004.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f48e789bdab36276b9cf553a20c3addb/32968034006.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/4521203071.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a606917cdd7---vepuberewufijajomixel.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/66536c5247395a968064ffd6d4d4de25/85777934483.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9ab55023---63353940195.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/9995208367.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/fagavelujitujenonari.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/82835547651.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e6eba6dd---73309626758.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d542e675db---39330707815.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64aa6bdc62---95579055477.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec31a6184---96069799962.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/lupugetofovutime.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/48547067680.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e363de684---91056078867.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/70lju7v2rnk6lp90gu4694qejt/36405789686.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/4444607.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb1929840---setiwivozumekiz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7976abd---40669936894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=soul+eater+personality+quizPDF 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_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 17356 bytes
SHA-256: e73efc2faff7c560347b53f7d56867dd1f2e459b9389f1605905aef52ec72e63
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10740 bytes
SHA-256: 95759e19ecbc147b90952afdb8cdf69f63be20729d9803e9956b5152f3a79327
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1