Malicious PDF — malware analysis report

Static analysis result for SHA-256 5020e8de49114853…

MALICIOUS

PDF

84.5 KB Created: 2021-07-28 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3dba12c9690b22480269cc43ad2bcef4 SHA-1: 537659dd778d6d66a2b2647c9e35744db056e21a SHA-256: 5020e8de491148534c7c0af3a3eb25e191b8f58fc0dabb4cbd567c097ef1ddf1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to serve a malicious payload. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://studiofapas.it/userfiles/files/17447674974.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c894948fa6---41616204700.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/98bf61ef305c68a44306fc93f11b13fe/doxoxipa.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/fevave.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pajikix.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/tekituw.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860007e631e---lilamesaxawekivexumu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/nibajozowuwonedikolan.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/86844505943.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/dizikoxugikojofivumu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pm4p6skp4576712btujnabiao8/kiwun.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/gobageguli.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418c31c4f2---pafazak.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/jegavotorapu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759ff1da434---sesuzo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ab50920f---tovukewafedagar.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/vunijefavenuki.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b35d58a32---nuzonubokewatelivawasoj.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/39595476909.pdfIn PDF document text
    • http://jkohut.pl/file/gobud.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d4a1fa794fd4f2b34da40b47b9ff125a/99439310809.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/73501348963.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b058398af629e2c56b6edc7b6ea1590b/deneli.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e91b5e11---gezekavanodofizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+excel+travel+expense+report+templatePDF 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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 17228 bytes
SHA-256: 03ec06f2fbfaf478b9a2f398e9e2d14e69c295b222dab679f65025c5b5186295
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 10588 bytes
SHA-256: 77078273bc4bd386b9f45df5186e96ccaa6f8a368a0c9c5369f88a2c569192d1

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