Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b83439fdc3a08…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 00:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b12b54ca0c7d9f60e628853fe0d16b73 SHA-1: 4fe3dda8289e95884e79f6cccdbc8a9f0e409745 SHA-256: 768b83439fdc3a08ec5744b96e5a083801b38efb1541df74c3edd18e23a386d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a campaign to drive traffic to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://regimhotelierbucuresti.com/images/userfiles/45157911349.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9348491d46d126e7a84493d1de9bf34d/13591412451.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d223a0c87d7cfb99f2ac22d633960320/zuguzonukopajataradiven.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i28mo4uodhashbid0sb3ges3j7/48855985437.pdfIn PDF document text
    • https://rcot.org/userfiles/file/zuxoguwirijudosiwawi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0d53eeb675dea9d3e650ee35453ca737/vilupokedodusakidakuxu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abaf01dda326d69d1c1539c2f5bf14db/zopubisawizotaz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0l7vas8oij41kbvi9jhmek9tu1/tubabebisawoxixawemugo.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/tedokapebekuzokedoj.pdfIn PDF document text
    • http://standardamulet.com/files/files/37588321757.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a124a4d0a075e8b7e86cd6e88522f776/94895926074.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/devurukofojibedepuxi.pdfIn PDF document text
    • http://schokobrunnen.com/idata/rugolumiwo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb74af93d3f---selizarokejumuxegezika.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430154630628552.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/27695461073.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35997660655.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2qibr4p7p7pfah2vvf1s90lds8/varisurefejagaparizitilo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0c576577---jegolorara.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/tekudogibutiwuperapepu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/99500624172.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/musemesajewoxugaperi.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/zefaziwajidoneloxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+free+pdf+to+word+converter+for+windows+7PDF 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16788 bytes
SHA-256: 942bf9f1dac387bca3ebcf9a3ee207c94c3e1e3632243754988a005179f7b0dd
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 10816 bytes
SHA-256: d72f7b4c7d595387418892384a1f8398239606fd2cbd6ffd0646abb6f966acab
font_02_sfnt_off00012606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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