Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c04e430ba37266…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 14:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5078c49210be05e16c830adb6f217ae6 SHA-1: 3419c28691416928867411af12cee2591f7bd493 SHA-256: 54c04e430ba37266eeabf510b69008870e54b8cf69e6d5227d860a0db45f3f51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users to click on these links, which then likely lead to the download or execution of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071000bc3285---senidemuxegusivamigiru.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0653e1cd05---toxewuxugesi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/at944ljl9mjt90s1kvir9f22m9/32227328657.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609774775f97a---sedusometatofifazetat.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/da1909e641de12b1b67c1d23ddf16e80/katebilonazapukulufoge.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c535dd69---fopazizikepodobemopimo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834298b4b75---17163029567.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/d0pgurpqdp33vgsgj01ggorvd3/2100630043.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/35eh327jetlfruqf1634rrqrnp/nekefazetaz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848490d7262---lawunagatonana.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d51ba0e7e---23306437678.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160993a119c0fd---79207453288.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/dutalowolelolaxitosekiwo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ba8d3b8b602475315e60b96b69927a51/5949529328.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xavinevutaxo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rcn0dcf4809lkt0r9fd4ve3c4v/ranupenurawufowevew.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e327e8c65963eb973a21c8437ae9203e/vowepape.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nokemulidisanixiluxas.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f05bd191---78560824160.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/fuwuwasivovawoniv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160942470a0816---tuxovigo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cf92a4d7287---jijuzipidi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6a33eeb5---13392214973.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4k1a4bb3o02m2r8kmr10an8mmo/21815374765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=seven+glands+in+human+bodyPDF 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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 10992 bytes
SHA-256: b921bfbf9842790adbd028eaee34429070afb634076ab19ca7dd4c25ef601ec1
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16600 bytes
SHA-256: 50d2aa1df04c51ea293209600b7d68a1cfe51d30083c818f66c22380a82db256
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1