Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16f09d743aa7b82…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 14:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 503d6f8cf345d02aa480590ba536c8db SHA-1: 65f9eb8413e86591f6a464572a127d8b535632de SHA-256: b16f09d743aa7b82ce3563d078d44d1d522926152091f81c793ea04d2b28c5ac
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple external URIs and a link farm heuristic indicates an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://bandai-k.com/userfiles/file/zigafefo.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c431f287bdc---nukitixoputotemowozux.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3f7eb604---nokipiteratig.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5d3390b7---vuxezimababuvukefo.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d642bd260---mafulonilixewi.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b145451a7a5---22770999239.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wejutaganizafulakapotota.pdf
    • http://bienbao.org/uploads/files/72544763787.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/96725412489.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/33b571a38de2291c2118ea3fb69a2206/15963818303.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/aa980d6901f7517e8514c96d6bcda033/60074032184.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4de49e9108d12be3f7ff76c96cf902be/petekuzu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab9e5ef75---55306898762.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/ketezebosofirukipex.pdf
    • https://travelstore.tn/userfiles/file/99860144355.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7o96nkrrcjqplhvn4ubdo447gi/xazalinojam.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c55680f8de87dc676a7f9fba444a1fa7/95528026838.pdf
    • http://s2ipower.com/survey/userfiles/files/52821737000.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4887d224c---tuwokuxefofaje.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nawejigefoseduvenukulutux.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6e2ea518---vovexukukelujelaket.pdf
    • http://sosnovgeo.ru/userfiles/file/bivezebixekodaxuradi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edd678697---97142271078.pdf
    • http://reicar.dk/userfiles/file/11856672910.pdf
    • https://honda-otolongan.com/upload/files/xuvigujukapazujovobese.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce87c5758---38826977105.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+open+blocked+pores
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 16792 bytes
font_01_sfnt_off000107b8.bin
d33887d5c562555a154b4998e459e09ff73c0b86fbc2d8df0fe775d9053292c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 10564 bytes
font_02_sfnt_off00011fbd.bin
92034fb4b7cc39b62ffa622205e3f1951cbb14072dcbcd7b5ca73bb1f7a242d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 16624 bytes

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