Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e890608ec58caac…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 20:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0e70f8688ae3d8652b89836452222e0 SHA-1: af6146e07bd52c9d6d2d9556666ad706e38d9508 SHA-256: 4e890608ec58caac81cea99e3d4705990b8a87456924c63703426ae57cdca722
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further malicious content or engaging in phishing activities. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://inwebjor.ru/uplcv?utm_term=ib+biology+online+course+book+2014+edition+pdf PDF link annotation
    • http://fixafilm.se/userfiles/file/96724098771.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dfe7feb5178ad5444a1498b5c77b287a/jujazesizebuv.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b758a4d43cd7e25bf649ae1f88c9c107/40654052566.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/354d48c68b2b3b9d9cfb1b57f5830167/769813901.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d433c1ed---77014706411.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b83e3fb79a9fb1262bbc93fa0f0d2da0/29936553646.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/bobukifiz.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593c81cb19---87970759725.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210622194815.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/18270b7bd7a58d79e67f16eac98e5445/wazoriguvidegiwoxoxul.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sf4ih0f7666gmeogpu15aj3d85/watobikodosa.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/60374625833.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/pinoj.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/tusalilekuza.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c321efcc75e---20633384597.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/sepuvilipot.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa3f55931---kitotutominutekipomomusi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd2869f8679684c29fe71c2c07b03233/vakigupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d51bdd941---gosugojivurulimedu.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gamurakulenozilerunefuri.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/wupevegisurateresiminazi.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/46358771273.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gr820iq6q3f91g91uj7at9v955/fajinekame.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_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 17520 bytes
SHA-256: 1e2bb735f47352504bc488725613efce2479e675d3f9ed4c8ee177fc15812cc2
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 11404 bytes
SHA-256: b6931bc4788286fd84ea8f8b482cb6b5fb61da097ba101404fda0b1e3dadc426

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