Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd12e760ce8eec42…

MALICIOUS

PDF

79.9 KB Created: 2021-10-12 00:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87ecdd4de9dffd4185d22f8fea068caa SHA-1: be90f33e7f40247b381a30fb37900c4f1bee610a SHA-256: dd12e760ce8eec42c3e7a79acb8e6549b7873da0743d06c378ee78664f9ece6f
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL findings suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://protum.se/file/kewabokesatobabukediku.pdf In PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/neritamomes.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jazajogosedigevomagovab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7da51ceca2b8a8f7a55cecace5b71fd9/dorivofaf.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/66378632854.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/bufikazemetitolepiw.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/nogasibodolevikomir.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/45983619453.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6a184a65---84506470831.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/63977296275.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/belasawojeworuzap.pdfIn PDF document text
    • http://www.celso.org/download/84382917887.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/pabisuzoguzaxoseruzibufu.pdfIn PDF document text
    • https://ibextrail.com/editor-images/8070867416.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/64093343400.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091007431749.pdfIn PDF document text
    • http://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/90643381626.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/dumimogugidunuwopapo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/274d92ff0a36c829786c091f2d96d18e/tekafegoxilofi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/35893723337.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/jozigekoxajudap.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/teluma.pdfIn PDF document text
    • https://nevisnews.com/userfiles/zorogi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/14858782745.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/59397793607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=can+you+tell+me+about+yourself+answerPDF 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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 17264 bytes
SHA-256: 673ccedc8c6385a12c22250ff6e04d33b5047003428f37e0583f6aa37032a8c1
font_02_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10752 bytes
SHA-256: 2c5f6275273091b932ba12eaf71ba33628f4379643306eb2ad5ed65b8b490e06

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