Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428eaaa5d1ab384…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8f29bfd188bea6e322b351a2372d39d1 SHA-1: d35f6f0c53ba536bde298656723a558aeffa888d SHA-256: c428eaaa5d1ab3848c0f2850febac791fcb33695997b33ed988691540c6cdb41
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malware. The presence of a 'minecraft apk download' URL suggests a social engineering lure. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=minecraft+apk+download+v1+14.30+2 PDF link annotation
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210919105448.pdfIn PDF document text
    • https://j26clean.com/upload/files/xejidazenavixumofix.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/kifutudilinizefaxinoxem.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d02de4768---binukodewuj.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6765a5d7---9626127035.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/gijuwawitatafoxuzi.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/14785382655.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/46061780752.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/37825556866.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/goxopeju.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161499e9b23e5d---gurasuzamawisojixosuvel.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/kesivilemobakovesoxe.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109030529185977.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/21185723133.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/476ae18dbb8bf2054a15c026ee063221/menasujatigupoton.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/lokemeb.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109242345285489.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/riworinibub.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75995496532.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/tatijujikop.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fh0btolujcth1a7ud82ul973a1/tubotirozonomaji.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/viwolifinugabun.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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 17348 bytes
SHA-256: 2ca4b4600bd8d97320336d862d828c8781c5970fdf5d1012ad82a23636802851
font_02_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 11292 bytes
SHA-256: a21f2b43ebcae7b354effe1f28518aa34dd4409c58eff3ad163cf3376908f867

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