Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14195ffe89293b9…

MALICIOUS

PDF

73.7 KB Created: 2021-07-08 01:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7832a31c3bd2f5d5d6afe4c0c58b3274 SHA-1: 90976718893daf861995e260cc958bda0f4ddf69 SHA-256: c14195ffe89293b987c7d2e4a1bfdafaf287b9b562ef1a11cab7c99eb3501080
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of numerous external links points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dcoderesearch.com/uploads/40120064215.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/giuoikm10m8tr1eoen2l0eu1c7/28760757760.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zizov1621386655.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/53c119f0de92739fb02e763334f3885d/lutanixajevorawufo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be06991ba33---pakibu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b604533a739---21670897468.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/51810524001.pdfIn PDF document text
    • http://metallpress.info/files/87611920165.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964cbdc4295---15223861478.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/momajigunizijugifebu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79311ee49---47911971185.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875b154bee---kasemodozefudanirepowo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/34552232613.pdfIn PDF document text
    • http://changdahk.com/upload/vukizegogevupag.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f13d0819f8ba184663f4b8f8989a960a/85927919649.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/36915536301.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/99536950181.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/64dd60e2fd83aaab990fa6c8d55d62dc/15422230910.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718e51b141d---75319038511.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609420b4dd360---xofesikopod.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/de40edb8895fb3fa142727f7d7020f5b/kogodaxozirokejebimodizun.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098877dca483---dapavobibupugufomokutu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15548401302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=scooter+service+manual+pdfPDF 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_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16044 bytes
SHA-256: 43f0430073df409940ef346135d845a1fa3a4bd7380c538d35ed6cb69c3e77e4
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 11020 bytes
SHA-256: 4c9c1702b9d91ea2841ac1f559628f8a4ecf6f45100642143500d45602954684
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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