Malicious PDF — malware analysis report

Static analysis result for SHA-256 99220f1bbcb30380…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 11:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f97d8a75f5257e90e19bbd4e9f6793a5 SHA-1: 4f6f37207a530ca1ed2da5f672f345a0114cf745 SHA-256: 99220f1bbcb30380e11894cd07eab1c30c95f3f5f333b85202ee66501a30102b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=spotify+old+version+android PDF link annotation
    • http://hagelkonzept.de/userfiles/file/pagamexikikub.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/sajodadibubogusod.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/37328674947.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/gadoropagizena.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jexukafoburube.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101609405340.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/67057489532.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/lezegodimuromizafudonaz.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/00ee8c150b1c2b204fa13d4d9759e12b/19558584092.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/buveni.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/mokekanipapapuzere.pdfIn PDF document text
    • http://wernitznigg.at/files/direfaxojakunimitokoxadig.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/62461332275.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/finagi.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060744552534.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/41426948446.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e9b60385---6125914638.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zosegojopadenovukovezewa.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/9597938776.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/19939165205.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/49998849699.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdba5ac10---fogutonomolijetitoboz.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/giruf.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/gulorinuradatagerefezaz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/11270720750.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 17796 bytes
SHA-256: b29959a7b78856e82972a793dd29ec31a7f4903ec76308e4250bf8513ec64165
font_01_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13766 10744 bytes
SHA-256: 923e269fce1c6ca239bc67bfb57b829bf8c79e7761e88a50a991fa813b04c6f2

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