Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084fad1dc062fe1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 12:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b48888a59c41fbeb46a4f4cd94d2af5a SHA-1: f26e6cd60be8d5714a479fabf7f9bb1d131a3ca2 SHA-256: a084fad1dc062fe147db35176eb32f9868a6e7065b7767a7c8bb4d71a7e8c477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=how+to+watch+pay+per+view+on+jailbroken+firestick PDF link annotation
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/jusafesu.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/linimiri.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/wexifozufevolug.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/48521118825.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/39611284934.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/13524668165.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/12058422277.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gugapunebibipirovuxokobe.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56456992856.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/movoxosejefisolol.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zabelolemogopipi.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/jujukapigin.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8af9b4b32dfc6b1c7f7b7d6115b7a9f9/7564902283.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawiwebexezokizimin.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/kurezo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/wupoxugozufinu.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/dulugu.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/dabiv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359197616dd---94632501550.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tebero.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/48332453293.pdfIn PDF document text
    • http://friulanapanini.com/images/file/delatupevekuzabaziga.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/xosujukapu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336567e81c3---25460831695.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/rirode.pdfIn PDF document text
    • 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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 11196 bytes
SHA-256: 3f268d55fec8fc0b12cfbe4d664b5572a31a47f2099f5c0649821a4299f4db14
font_01_sfnt_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16700 bytes
SHA-256: 53c169a282397e9c40859caefbbb7352c83d9be44edaaabad68d6b5a313d4aee
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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