Malicious PDF — malware analysis report

Static analysis result for SHA-256 19582e8b8fc5a00d…

MALICIOUS

PDF

79.3 KB Created: 2021-06-26 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d417ff20f9b172c13590aebb6033196 SHA-1: c13b867aa3cc37ec4316b79587b15f3e0453a1c1 SHA-256: 19582e8b8fc5a00d4ccdaa04072e84991d1ee0ff7df98c42870f5cfd6dbe27bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h9fhhm5722l36pv5t90rpt4jfj/zujenipojofusowikidowu.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af2fb581385---18213649203.pdfIn PDF document text
    • http://momsystem.ru/public/file/sazufu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sulumegej.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd225c8f3f136873b9801569a95a3f28/91584053297.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f6dbe6be26833ac1db883cad1cac9af7/pafajoxurizowavibug.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f3b6dc91cd593694bc16c03f469f6c33/71022266362.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210612_25C60C08733E3AEA.pdfIn PDF document text
    • http://bociany.sk/media/file/nuvezewez.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/lofixo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/834f78b8ab3efe5fd4e8a8771cc6e08a/vuzuteminamotutedufalanux.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/11559917107.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/97824267091.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/41ec6fd217f6b9a4528078617f0a5183/74830059594.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tps6s6f58i4530eob8g4jbm137/66238647788.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/92197676414.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96a59f010a2ed05e505d053fc71285a4/34085591271.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5cca1eb614476c939672043dfd803371/47863019977.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/tc7mftlecugtmdr7vui38kbf8m/juveritudo.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/jomulasepazajasif.pdfIn PDF document text
    • https://actor-conseil.com/files/file/76317066660.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/18756853365.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12700955216.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c12c6dae02c71dcb7248c351cb33b004/sokez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mont+orford+parc+nationalPDF 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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 10308 bytes
SHA-256: 245a8e4843b74db720cc3a883ee986fe74978124d983eb4bed4fdf730981fcce
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 17956 bytes
SHA-256: a48ca2430a733fb02d4b39add5b0e233346b1dbe64b2852b5c3f782aefcfe13e