Malicious PDF — malware analysis report

Static analysis result for SHA-256 d587ae7c8e28a029…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 03:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 969e0d8993c51aca0970b292a81de4c8 SHA-1: 8d818eb42331240ac3ffb11c8323fa9dbb278d02 SHA-256: d587ae7c8e28a029c32c2560d1f23b4e4c7016e36ce2b89f9b8851af61de5633
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, and it employs social engineering tactics like ClickFix to lure users into executing commands. The document's intent is to deceive the user into running a malicious command via the clipboard, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://s4l.vn/storage/ckfinder/files/69699604418.pdf In PDF document text
    • http://syarmarka.ru/userfiles/files/rapusufizurojifux.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/xuvibesi.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/18387461345.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/1897735968.pdfIn PDF document text
    • https://kratky.eu/files/file/tojelanimewuxaxapamidem.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tozejenoluguzaroz.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///68140577202.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109160019576689.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e124452---bigatodujigetes.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/57903926002.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/gufopevigam.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/fewatasemuwana.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135889099a0a---gadif.pdfIn PDF document text
    • https://trainova.com/userfiles/file/mugubunovep.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nisesirapasavugu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210904213616.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/zepulosaliweb.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/46f23ffffb673eb970781dd908d4e741/33015687888.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/50199276819.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85168305935.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36319837959.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78101032701.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/rijupusaziruvebuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=modern+setup+host+has+stopped+working+while+upgrading+to+windows+10PDF 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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 11116 bytes
SHA-256: d2d3ea8f74f626c981295de6b465d1737863dcabb59297f7a9417db732196dad
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 19148 bytes
SHA-256: 83b11d61eb704a5f8b08ab36164c6e5184ccb20695e9830bf2dd08fcfa57d04c
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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