Malicious PDF — malware analysis report

Static analysis result for SHA-256 71abee00eeb69ce3…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 18:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b19d49c2427a913cf58280e04d205611 SHA-1: 8ef8e58add6030b3f299cf82b170c17659171244 SHA-256: 71abee00eeb69ce36b307f8801ec0ac493325c09889681f37ccb8dade6cb3ace
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of link farms on disposable hosting, suggesting a phishing or redirection attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the nature of the URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=formula+para+calcular+sueldo+en+excel PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1f8d1820---piniwimil.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/ronusivuwabetoxe.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/9543496479.pdfIn PDF document text
    • http://elmaga.lt/components/com_mijoshop/opencart/image/data/files/63636085419.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b54e0ddb2---21880648111.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2397f369ea3a5f9611d14fef0958e734/lorabowi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/78631051855.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7d2f031b---pitapusagojen.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210704_98B0CE75094B549F.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nugenizavogamerudegosu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/18119602709.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69373677432.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609086122eeca---76390600407.pdfIn PDF document text
    • https://smartdeal.pl/files/upload/files/vujoguwojesixofidelarelol.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a7560a328---lenexegutogo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jerafejib.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9svefd46jmtr2hq691er95p3n2/liluzo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/13574041997.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/60465778473.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/75083317495.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/gozizawix.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fadb1a44f65c3d705137ed324f6b3600/nogawomofoloterif.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bf775d643---53536955136.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06962e39b---91970986142.pdfIn PDF document text
    • 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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10664 bytes
SHA-256: da2821ccc40a3182ea103bb09c3d1d8932843b17645d05eed410a586d814461c
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 18612 bytes
SHA-256: f07185710f8e82160b45e51b03e2d7e97e1c841d742e4739f2a0aa38c146d557

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