Malicious PDF — malware analysis report

Static analysis result for SHA-256 558439fc38f8aad2…

MALICIOUS

PDF

104.1 KB Created: 2021-08-12 13:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 594cad129bba011b5468651cb30c7776 SHA-1: 1d264e9da192a4d4a05bb6003caa9795899ac19b SHA-256: 558439fc38f8aad2f48c5ba6bfc00830bc4c8380bfdfc2c7f4fa62b3db5f685e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and link farms on disposable hosting further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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 http://oaklandscreche.ie/userfiles/files/dofetovudigiletoli.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e832418fc3---9940532366.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e6ae986b9a7eac73916144fb392f54f2/vunubutirefarepi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5b2750ca7263891ddcd458cf9df0a02/64210188262.pdfIn PDF document text
    • https://nexusmediation.nl/files/foxevijox.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/25777814260.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae282986639---86541118352.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b9558c058c02df49f083eeeaad735693/febagijotewemifanufatodaw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d52924c8---dugudizadelisodof.pdfIn PDF document text
    • http://centrons.com/uploaded/file/86021950960f00ce90d670.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1bb8e767d---jegepevigirusotosatot.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jap5ago90ftkjoi71gvupuovrd/revogigenu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7924546126.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8426a4ac---minukakuf.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/rojunitomoribotes.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/35656689468.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade313e0d91---62825264710.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vabawumopevanupez.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cde87bd38---tikajokadal.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f76921ceae0108929fd0bb3f3218f94f/jedoxegigej.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160707c337efff---todizadato.pdfIn PDF document text
    • https://soechi.com/userfiles/file/duvukisesajogawo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161111f1e24590---xazivir.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/mopatufotinosevisobetip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bleach+brave+souls+hack+ios+jailbreakPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 10704 bytes
SHA-256: 90f9a0f841cf795b64eb9e96f792419f1e1463c7b903d7a0a71f608472f1bd4d
font_01_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 22684 bytes
SHA-256: b45b735025ed98ca7a58028706ed4df18ff67d8ddd7de4ed1715687515fba30d
font_03_sfnt_off0001603b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603B 17204 bytes
SHA-256: 52c0e2461a94dd4211d4b2e42f473d38bd8aec8dbfe38849490d32c892c5ed6a
font_04_sfnt_off000178ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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