Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc97412c816246f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b21ce617465dccb91374f1fcd96f8485 SHA-1: 65bc25d102a59c6e2077855357d333c64928a163 SHA-256: 4bc97412c816246f6072f98274c3596e70f4d83f48c46766e1058f1120a11d91
252 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript, a link farm pointing to compromised WordPress sites, and social engineering lures designed to trick users into executing commands. The heuristics indicate the document attempts to impersonate a download, likely to facilitate the execution of a second-stage payload via user interaction with the clipboard or terminal. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 10

  • 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.
  • 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.
  • 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://medvor.ru/uplcv?utm_term=download+pygame+tutorial+pdf PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ffa1e865297b258f33f7d8934b2f78e/82141308146.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/lepadodosasujejavawafe.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/39813274569.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/db98666b26be4936e0fcfb1e152fec96/futezupame.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/2749346477.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff12c471f1---xubivazezuluxipinegekugik.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/20115186427.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806127ae1ed---79941947345.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c281f7c4f8c---zexapuxosiwaxegotuxa.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fad9c8e52189fff7650dd1cd41d041bf/74512135493.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813a24a7c37---77889283662.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3713861b---74966998858.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/16796555094.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2c11e4f6---56774046483.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/65131529551.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a1755691---pozoderafobe.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/futojugakel.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mg2rmi2kr5o8gegdknvqlfqtt2/79685403583.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/78682045503.pdfIn PDF document text
    • http://erex.hu/upload/file/suvozatejulagobuw.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/78721553055.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/31315438517.pdfIn PDF document text
    • http://mesterek.net/tmp/79076425628.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9dc05347e---69620062539.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 18720 bytes
SHA-256: 46ea9e5b03c3370e9602708d05392104f5df34783d336714459b626c83f05cb1
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 10972 bytes
SHA-256: f735fd277a921a64c2404ba761bfb0fbd6c32baa7ff8a420a1d2c8cb90be968c

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