Malicious PDF — malware analysis report

Static analysis result for SHA-256 6513cd51b45f1e33…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 18:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fca3a5aef86ea16691ade4d9ff0d418 SHA-1: 7e563ca47adfdcc469c746ccfc3992701f748330 SHA-256: 6513cd51b45f1e33817afec90051b3f3c15441a1f7e638140587dbec7e372375
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mobilesamara.com/img/files/file/repabipuwazelubarowodir.pdf In PDF document text
    • http://highlevel.pl/userfiles/file/nibivuf.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/zixoxis.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/foribinavatipilamedigav.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/44512966345.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164165eea---25321249919.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/29947810439.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/53ced7vn18j24mkk38al0lj4s6/42427005738.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/rafepujomimijisapudas.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136818d4f336---wododalelalaro.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24a9a5270---91438954426.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/pewod.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vatomumo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/12233827383.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/luxaxijepeb.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc1bee5471---kakazironekufuxosoniw.pdfIn PDF document text
    • http://186086.com/upload/files/levudufivika.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88595185714.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/towilevenil.pdfIn PDF document text
    • http://newo.ru/files/files/15221708210.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/junubova.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/36324359099.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210911213632_1788033621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wolverine+theme+for+androidPDF 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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 10512 bytes
SHA-256: 0b8eabe421306d9b7ff4ac2d7673741f110ed23cab8978bc16832e54367c17e7
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 18148 bytes
SHA-256: 41401e27fb9306f5ec73d37e06a7999a1c17be2b4f79519983ae8830e5fbeda1

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