Malicious PDF — malware analysis report

Static analysis result for SHA-256 8515d4efd919ed0c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-24 00:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ceaa6cf3177173726f567f4519645128 SHA-1: 1e26040a576146ca69d7e66214575c9b493bfa39 SHA-256: 8515d4efd919ed0c07b8fb20aaa6c3c9a43ddc8a1851128a7cb838f4f17dccd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files, suggesting a phishing or malware distribution campaign. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medsplus.us/admin/images/file/giwoginezamuz.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/59416878311.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/pigoxojejemexudovujunonox.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/15f6c1db7284643f6bfa4bea7004ad12/fupinirapuloluvolisavoxub.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c76fe71bda---58311068927.pdfIn PDF document text
    • https://slide-bearing.com/d/files/tatemekudozutodinelimed.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/64441129185.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139215f87040---70700395557.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/ziluzajoxi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a8063231---reronirimidipolozojuwej.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/xozobijixuferevis.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25e2cecd3---78608064360.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/mutidifakepodipivukoxifa.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/75692685690.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/wegamijonam.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/58332114280.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jixewimogiluronu.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/69753647908.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gotelizejudokowonadifu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161318f8154f72---87203471201.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/99193040471.pdfIn PDF document text
    • http://wohntraumgmbh.at/95813933099.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/fidabuzegaduxej.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/guwuwotejejaf.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/82821885619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=galaxy+a21s+touch+sensitivityPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 18372 bytes
SHA-256: 6e344d75a16cdd6e40597d2a333ce01e0fbb86e97f1814f8b9c487b5474c5725
font_02_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 10820 bytes
SHA-256: 7f0c9c205519842df7802f0f60ada0bb541b1872be3a8ce17367c1676fbfd992

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