Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ed135925e1fcb…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 00:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 36e16600f845f7764a8ef2a6a7e214d8 SHA-1: 84d823649088190b8faa31664aeb3d942f15129b SHA-256: d23ed135925e1fcb6c564b6955878c8f75445684bdaacc6d0dcdc38cb999a7be
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains multiple embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. These links likely serve as redirects to phishing or malware distribution sites, a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://appli-veolia.net/ckfinder/userfiles/files/67925438870.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/81628289581.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/77384318428.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/19293fcf1024961f6b3ca6b4a7d5d97d/27125114704.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/nekekabelizoluvonuromete.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a285014ad8a---79812560375.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969bfc03103---56633227780.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/81155400327.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dmotql2h2fa4lo74r1auq2o2qt/5318978355.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tebjrspqqbc19ior96rmgsucqv/rogejewakozavisuli.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e90ef38c2---gesalapoxipomuruvamaru.pdfIn PDF document text
    • https://temahr.hr/files/63837838736.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/timam.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ecdbfdeab94026cc741420b70603a45a/74274500458.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/66711231270.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160941373c9e93---49417639760.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fb8f791a9ad29cfbd451f9eda200a9e0/pajaruji.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/39485876970.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f94f758ee---biwoni.pdfIn PDF document text
    • https://p87.hu/files/16531482082.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/15996594471.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/74d3d57511799c28372a4186d8a364f8/78784063294.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/84087444727.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ceec52f14---94194239386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=last+day+on+earth+survival+season+14PDF 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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 10712 bytes
SHA-256: 1c4b2038d7ceaced854462e37df26c32004de809be26f19d7409ab5f4722afc9
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 17360 bytes
SHA-256: f6bf845c65682c2ab73a693fee3ea308607adca8576a6290f85c6973d66138eb

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