Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd24f2373ea07d13…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 00:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3e75df3824d2621eefb55c16592c9c8 SHA-1: 0a02876126159c95a3ce2bc128b4975ffb6917d9 SHA-256: cd24f2373ea07d13e4f29ea1cdae59afdb50638594709b0ebdcf915f391d3b5f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'fake invoice / payment lure' heuristic further supports this, indicating the document is designed to trick the user into downloading a malicious payload. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=tally+erp+shortcut+keys+pdf PDF link annotation
    • http://orvositudasbazis.eu/images/upload/file/vasimu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612811658e9cc---xudupuponakuf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/83196471319.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qg7jfa30gja3mcobapprft3hf3/zifezefejipe.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210804032639131.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648d3d37b9---59518023094.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609188d5d942f---94037563169.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vobuzigavexuxob.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/8f81a05e093f91cd2cbcb8bacbca0524/73421047762.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rledr8r4b89fhpeh7qdapg8v04/70570960360.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xadiwajifewi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/39476975598.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108240437317893.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084daf253c87---zapevoxorifudemujefet.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab711e7b41---7999415976.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/fojakutidivuzorikafak.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f0e4767f5---fezoxa.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/gifij.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fee808ca79e508ce719ddc8abd2bfc67/zafumupatoz.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/30867406255.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4234e6c83---tajojaxijimin.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa57bb7d6d---91002890325.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/69390097291.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cmridmcv1a5ipiab6ra0jnud21/61169755074.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/guzudoxebemagasovujurip.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 18424 bytes
SHA-256: 3541c64b53824ffed0552d2ea5d9a18a6024bf2fdbdf943c9bd08aa28af542f7
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10792 bytes
SHA-256: 52bc0c44b5c2952ae6f59203ad42d6df8ffa48c4298e8e64e17be69ee2f7ab76
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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