Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0762868dd832ba…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 15:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5e5141d9ad44f45d0cd522e703347c3 SHA-1: e8131e24d87898e8c19eb1174005a54a06dbbad3 SHA-256: 4b0762868dd832ba52a3ac5642e304df327bf7d1f81b2e87fcc98ec02326a4dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based lure and numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of external URIs and link farms indicates a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6gbma1pt9jntlin27k5jusrl51/medujanemizuvujobapezil.pdf In PDF document text
    • http://yibetter.com/data/files/80836107867.pdfIn PDF document text
    • http://asja.ua/userfiles/file/94937835486.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zategitetoluk.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/wifat.pdfIn PDF document text
    • http://tcihk.com/userfiles/27941033336.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbcb043bb5---jaropo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jorarotudegabot.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/20257705189.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/sujiwixapiwutejakakepu.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7447141108.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n5cnj57vfm5c16nqmoq3fthu75/birasova.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/96401118471.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2papgk6vqs9e69ks50ru9ehl0/begunomofodoxoboxo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7e9a0a26---26952484499.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/40207463918.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/216de92b56116ffd8bd6334d50b1dab5/81543384942.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/72542727725.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/88041467097.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/puxenokapofaluneve.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rukaromakizikevuvud.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/gupapibobigejilejas.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/8208505111.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/97278548403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+ringtone+android+gratisPDF link annotation
    • 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_off0000afdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 14204 bytes
SHA-256: 4273bfe0aaa6e404db8300eca5748a7b0eca1e15b53c78d9bc9f3afe10936e97
font_02_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10508 bytes
SHA-256: ef185e77bc85de297700855bd2dcd46e8482771e02c5a0915825f04aea02f833