Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eee510395f476ab…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 17:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e6a8a415db9e465b82aaecde7001257 SHA-1: 004eec5efcd078013b06f3d78883d1f83192306a SHA-256: 1eee510395f476ab45d0a180a58de0fbf23e68be4a6fb99fcd84a8b69ceb73b7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm, with several heuristics indicating a compromised or disposable hosting setup. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button lure reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=farmer+simulator+16+mod+apk PDF link annotation
    • http://moscowfashion.net/content/xuploadimages/file/devududemirupuvaduxo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/koloworuxebuxad.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/78571448875.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/75692278692.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/ronofejaduxidoku.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/3386754977.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/katizifisekoluru.pdfIn PDF document text
    • https://atrax.hr/files/32064647282.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/71717400598.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613638f22886a---jawis.pdfIn PDF document text
    • https://upaspor.com/resimler/files/segekawavunukul.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/56361850800.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/koxijuvip.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/luvuru.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/26828122214.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8e77ccaf150bd598dead3c600c01cc70/puxobovuwikuwos.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021d31b3b2---vuwiwi.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fenerejosikotatix.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/86396509028.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/tigenoxanimowubovafefuf.pdfIn PDF document text
    • http://ailizia.com/userfiles/50629069697.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/beibg4bvs53qi4r34p1si3m4h6/denumale.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 17640 bytes
SHA-256: 125d3f06fbbef4c1d8a14d17e514f649baa94b5eab208fab0ef2e7d7fe63486a
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 10840 bytes
SHA-256: dfbf91a90d3f74d45863b6507c90b466317fc96716c45f58e9a30d8e8a7731d1

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