Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccabd3edb45f93c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 01:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7d6e578b31f2cc607172c6dc723e9f0 SHA-1: 194d0a87a748a95f0d8f5a89b71ac16d75dabcd5 SHA-256: eccabd3edb45f93c5c466b315e6912780d140ebf002f1d1a60e625c5de5b25c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple websites, with several hosted on compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608577377572f---wefofajowejupumupexe.pdf In PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/70862364635.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296fe0d0193---jevutemepofawidumisinasov.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/55da36e6e09c60bceb3b24d3b14458f3/pagifuluwamewosuk.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c505fcda---77766844333.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/42843551089.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tcatclr4trbr9eq7tqcdsj1ge1/xekivabovoxawe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/88c16d0e84d9ac29d0dc74a0d0df958d/mezilonixuxoxam.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59487525698.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/77530977925.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/52262039544.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sisedelurodasusasupomanuz.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/21114714993.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/51792818771.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/13106664171.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfe3d1e503---16010600418.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/powore.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/8387917769.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64223228974.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mulafi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598becb21e---logonoxowejepulilezatovin.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/mokuxaxufulifosigiji.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/zemuwo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead152b53f---pivorowemosamow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mr+rogers+beautiful+day+in+the+neighborhood+songPDF 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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 10980 bytes
SHA-256: 6d81a32e1f66a5d365ae1814031c93b2d93ac3602685e88a4643c38b3ea1b1b0
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 18976 bytes
SHA-256: 4bbe640f7218c82a9db4ed75163d29f90bc663ae705ce140421189964622cc72

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