Malicious PDF — malware analysis report

Static analysis result for SHA-256 1569aab41c8cc002…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 10:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74370b3ada1d68cfd91fb65df35d4b0c SHA-1: 54363657dfd1e4154a08f715309d8e4fe6452207 SHA-256: 1569aab41c8cc00261fe17982927e7d866b731b8fe22050379815fbf10461789
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://educaholistica.com/resources/img/imagesck/files/50644869183.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3451dc25---lobod.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a892cfacd39---7785408892.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/repuxutomaxezezowu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///forozotipenadoxuvorixowi.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202108262203564855.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8ca745c26---27648843075.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98ba4e37b314af5a01d1502831bf5a5d/livasunusurupadatowuvap.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gezivatimepis.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c033139206c---1588387314.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/lirutafilikovo.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/nijabusawale.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123ac5c0724e---16300825460.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafd1868dd---30466705748.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/11900619314.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db80576d74d---94510034941.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf12f2842b---dasebolajenugigexe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/58814457955.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/papokar.pdfIn PDF document text
    • http://chromatographvials.com/d/files/gezuxujafedujadufefudeba.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/10401964392.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/larumulapawarofixibidini.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/livikativugemeda.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160db32c5cc4ca---kimenofuboj.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ca29137c97461f5b8ee17ec79e60445/93391066131.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9de60c571---sitivikuwezis.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216241216278402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=open+the+pdf+file+onlinePDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10188 bytes
SHA-256: c32eee0fc2661163ee1c2fc128f938dbd94997cfd87fbaf45b83923bea43ee09
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 17320 bytes
SHA-256: 6af6cf1fb833e5c778b71866ece9c4fe112ee2b27c1eac129aa6c74c2cc39377
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1