Malicious PDF — malware analysis report

Static analysis result for SHA-256 c334cf5f90bd0736…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 01:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52671b9ab097e9a927a77904dd14bdb8 SHA-1: e6470690b2e176ba901270293508a328f990f3dc SHA-256: c334cf5f90bd0736c775cf5edd5a476b5eccb01aac5744933c4e2fbeb2b8b87a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript stream is likely responsible for redirecting the user to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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://laborke.ru/uplcv?utm_term=uwc+prospectus+2020+pdf+download PDF link annotation
    • http://bearings-home.com/userfiles/file/47624823443.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ma34offp4e0vihreoh4ds3acad/15320821101.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/10081989378.pdfIn PDF document text
    • http://3q1p.com/upload/file/210706232143617126mp6h9tz83vmv.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/82879126011.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lotagusebetusadafozepaku.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/57ff84423efc88d95d5f8fb888b26938/pofopawofeselapiziwaxa.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/guwuwon.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863274c92ac---52409587559.pdfIn PDF document text
    • https://kildevangen.dk/files/663067880.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/29222856807.pdfIn PDF document text
    • http://coffee33.ru/archive/file/29548561381.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bemumizisusasibonunutitox.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/dewagirel.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/47639460632.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad1d0febf---72174157988.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zakisuvegexodikage.pdfIn PDF document text
    • https://vitanov.rs/files/pusujinamolimiru.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/werod.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/7512535248.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/52a907af6bf1f122d3ecc3fa37f5c03c/56082630173.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/veguduzu.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_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 16756 bytes
SHA-256: 398201d335e92e40c471a0bd8c43284f468174c53be045f340015b0ea6b02a7f
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 10956 bytes
SHA-256: e673471b3c2d68a6c96d4050d16c2fe2729e2486d32da6c65a714e8c06420ddd
font_02_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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