Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4613802de360e22…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 06:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee8f82df99d9cba2a1308b37f8284a42 SHA-1: 78ea13d603e2824d1325a3e023d98fc7c530fa66 SHA-256: f4613802de360e225380496448bd6ced978164b2de3d3cddbf5d85bb18dd1d22
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, and explicitly lures users with a 'download button' to install browser extensions or updates. This social engineering tactic is a common method for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://archism.ru/uplcv?utm_term=android+broken+screen+mirror PDF link annotation
    • http://stisk.com/file/rofipefomefebun.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wuloroligesuporowiz.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/19143431668.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e5be7e977c3f7d83120e56a61c55d163/sokek.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/rapabofol.pdfIn PDF document text
    • http://qdjshg.com/files/file/balikikesedamavatoxu.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xagapeweru.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/guzaxuzifofuxajar.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/3957364791.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210913123453.pdfIn PDF document text
    • https://partnermind.cz/images/files/15624340797.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/8792214530.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f784a0ce31---41141437965.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zajefusagovuvetizabifab.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/losenojodipiwaw.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/52944563256.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/97504309079.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/divitaredetogedum.pdfIn PDF document text
    • http://stonebreaker.at/lupalirum.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/24570047193.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/16b46c74a87530a83b6eb04668422d17/53195608639.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10440 bytes
SHA-256: cfb173ed1e6c8a9c8a9befa745ea7caa12226212fe86711bc860a0cbb0647bd8
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 17096 bytes
SHA-256: fe484187f2b6081bfb1263a303d702935969566fdf16379a278d6fdcc7e1a6a5

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