Malicious PDF — malware analysis report

Static analysis result for SHA-256 243eb0f2b7ee4cc6…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 00:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3109b8446e4872051d7a5721f5e763d2 SHA-1: ffeb084c9b5b80a6c899e4e35c329b0355f973f2 SHA-256: 243eb0f2b7ee4cc6f3012dcb17f091dea290e8f72d111706b3892de0ce5919fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the presence of multiple links to potentially malicious PDFs indicates a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb880952c3b---37571202127.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/16fc42b95ecfcd554691564fbcf04eca/faxanigowetokagek.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2766ae0d0d---90385438719.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/pibele.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bf143103---jezinilavuwelugonevazeb.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7949482cd49f9896240eb50a997fdbc7/4162970428.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/rakuvor.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbcf8191d---93749623907.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607989de5473e---47649469205.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/doxulofazazimediganugexof.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/kilolegakixek.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/kisenupelunonefifibap.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5adaa5319c5c4f9d772ef77b8eed93e2/64841850401.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/xupifevufalovojidux.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdd4b45be---48538432827.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/fakagidisuvuzoxuwilil.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/xifugawejijikeku.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/70990317021.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/860c9c24929e70dd00b66f0d13042df5/jikoruzi.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/pixasa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0af8b756---vanolenodupimudi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab576eb38f48ea477fd534d4c7a8e431/potafaguvawekimotak.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dududikafijibexasuduselo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfe9c9cc0---mavutorifukuvozow.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/772ff2fbf7fedf800864c745a440d271/bajededawirojipolapulogox.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/29246680691.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/4457348306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dumper+test+questions+and+answersPDF 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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 20040 bytes
SHA-256: 7a5501bf550ee29725d7110c0dd0f61518de6bd3d72dd61d63c02dbb3ee013e7
font_02_sfnt_off000139e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 10840 bytes
SHA-256: 580e2d64f6133cf12ce0931598520e7ed7667f27600ca053c3e8731c393fca81

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