Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bd263cecd550d0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 07:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bdde4f80612481a062830fb833b61e8 SHA-1: 98d98c3ee66dafb19254586622a75d884d03232e SHA-256: 51bd263cecd550d08fa5a0acac6414aa7a077a5e8c4664ab6512c002f65c6880
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a lure to download further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://agriturismocorteerbatici.it/userfiles/files/73714891966.pdf In PDF document text
    • https://organicfertilizerproduction.com/d/files/fapegatiguburefisidudod.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68752106112.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2rmuaedq0jp4dctpqoe3hl8h11/vafoxebagaketuxu.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/70096677213.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2977b2891b---warofimovodenamanobazivuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391eb73c3d---repabopa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce60284b78---35978067791.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f82b933d6---bemevadeb.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/56883399045.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cb998d84---28062615216.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/vajebeviwixuvarunabuj.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/pikomebiw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tit0mcioje821lqa8cgjg2j572/74614485400.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/mirawukopu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kiioi8n6i6a8s0h0hc1p61ur6g/sumugufubedol.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/buwenubi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xulavanupexuv.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54877184812.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7ehsp94ubedtduih9dhh52gqvs/fefibozixi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adafbe9b78---27557320159.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jinulekip.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff74c3c2b3---jijibamozuxaker.pdfIn PDF document text
    • http://lawngo.net/fckfiles/24022491757.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/49709781568.pdfIn PDF document text
    • http://usmleworkout.com/files/file/1047703577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=coleman+powermate+maxa+5000+er+manualPDF 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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10728 bytes
SHA-256: a9b3f7eaf26a6c121211fcd39e8cc67378861560afaca81829827bf6fbd36daa
font_02_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 18104 bytes
SHA-256: 155141f40f1195b994ddbe52af3be9a9f3425fe6eefd2d62a4e66d8a9a1a9c7b