Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e6f80a5a8b5056…

MALICIOUS

PDF

84.6 KB Created: 2021-07-01 18:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8a1c161ac1c5ec39cd0847701ba78c13 SHA-1: 85ee90ac863f412f007f1ea356a6f39d60e0a7f9 SHA-256: a4e6f80a5a8b505616271c1511f4a2ebaba6abf15fb6842cf220157d4784c486
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=french+stories+for+children+pdf PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31bbca0cd---ketijajekugifo.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/21076131462.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/h3etrle3jc5ilat5hii5pmmg1e/xivibiboribupo.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/23420737430.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s2226s29ollmuvrta9g9hnmvo4/tonezik.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/fbdabb8a8251218798c5dc46314a7b6f/tadunumenivikijojiwamixi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/u720pmvolmmp1m6t3lhkoma7k6/musikemafomamoworo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0a2d39b602c6d22869304f80c7744bb0/71461506294.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/79175105431.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e03b95932---laguzejerigudisozop.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/37856420924.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077266d32791---89054052684.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/7059709722.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/is9cbibfs95d1s28eos65125n2/25017033776.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/komigodo.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/juzakarojajiwabow.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pigimepisugiwofa.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6435bfdd4a3d5c0ce060f2fae85fb7a7/jabaxivi.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/54259231143.pdfIn PDF document text
    • https://congchung7.com/upload/file/xovexajarokamutolexuxen.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e04f27ecb---laxebapebirukasekupinep.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/99803030129.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/cbc0691f2edc028c2faca0c3ceb41f4d/tadomazadevubojulosilu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b510e65d9e2---bujizezuxixarav.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/dd55cb2a11bcea97326cab3ed98b9041/nedivifedirunazapeviv.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16452 bytes
SHA-256: 1d2df31be00541a08c90c95a799a18865e225b6674c09e322006a25e10bdeb47
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10532 bytes
SHA-256: 7a5158cf40e9497bd06dfd9fb202b8fb1a6271d12fa126a1050a0ecef9ca63fe
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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