Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9690ed45675d240…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 05:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2930d12cc7e06ee1f079f50dabdee9b SHA-1: a1796a85013a6820e24ba651fa3e6082b7338bfe SHA-256: b9690ed45675d2402cb01a63c7609ca5b74cb7dd7c065ccceb3d5c517010cddf
172 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests the document is designed to redirect users to download further malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=general+english+test+with+answers+pdf PDF link annotation
    • https://khonggiansangtao.com/platformecom/img/upload/file/97212241681.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/94709310966.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/78454723432.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/vazezitem.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xagixatov.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/vejawonebovexozobe.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/60010637289.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/gaxukadedijuxiwujil.pdfIn PDF document text
    • http://drironcat.com/images/file/nujetiporozefajamufugo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2922a0b8---30061335285.pdfIn PDF document text
    • http://seritour.com/rsm/files/kugibinopol.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zimizipipab.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/lifodatumogaxi.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/saxumadixitavoxeza.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/dodufuzagugo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317f59d7966---43950666143.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139abfa7f603---woguzureponese.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lavugipov.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/gofekipipajumibilosizobo.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/rejugakunekukowujudaxe.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630508177463.pdfIn PDF document text
    • http://ubest.ru/images/file/70911173655.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/96173879340.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/divaloxesem.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/51469820736.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 10780 bytes
SHA-256: 595cceb623f7e4e93f183b6ffdefa00b42358859e41c1af4a469951eb66c71a8
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 17136 bytes
SHA-256: 9310331706213aebb0b3025e5b4e95e6f1161bc678317918e03e787a6dc01509

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