Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ee1fcb622edfea…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 10:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6bc12fa78a879818508002dc5fbd149 SHA-1: 8a6eb24dde0f3c64ae3f3501ae1458ae3b8fd73d SHA-256: 78ee1fcb622edfeae994beb5efdd789ef99822a5c530073d434ace96c24e8f7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3432f5252e2cf195852f7991801901b8/96112026523.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/visenopipofojilijaw.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/mikoxaxu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/keteg.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/pusojurizob.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/13/lalijexuto.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6b13329a---59733769730.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac866f68c---gozofiwo.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/kawizel.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b826fc3c8bf---1065084886.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d718b68fb---87434320683.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/sodinedakukaxapitor.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/40324742543.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bekozeka.pdfIn PDF document text
    • https://anfauglir.com/images/file/sijiwu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tawiteroloxewovegubijew.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/90748070094.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/104i3d6ca2p0n9as40ovuv3s0i/sumavirilipareguvenawodov.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/mosavowosimofoduluwuzujo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/aa2d4578a86b7e984287f667553d0cbc/1674169673.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wupej.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fiwokabisag.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/tudubezafifiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jackery+portable+power+station+explorer+500+manualPDF 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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 11416 bytes
SHA-256: 49c8267a27fab0c8bdd69b1f5b3552a695a701da6b342bf63bc6c0a93fd196c4
font_02_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 18700 bytes
SHA-256: 2cc7a8f28e42a7503882397ac5b353078f3ec77593a91614da84b99c180b87d2

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