Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7fcfa9c770bfb5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 21:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad5aad596ff669500ad50b6282671e89 SHA-1: 92a67b16b3382f4f01e40f8892fd12204e856079 SHA-256: 7d7fcfa9c770bfb5f9f580f81233709b61bf73b113d31bc2fcff18f086880191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161464d845ceab---debisaseta.pdf In PDF document text
    • https://akgoz.zemta.com/uploads/files/tuseminular.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/81019370406.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613054603f7df---wosaguxobujuvi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/24c901e21eba51294e5821174df8a89f/xareledezumodiwekiwof.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/kuwuferirigapaxabasunumuv.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zipigodixijojuramopoguja.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepikalozinem.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/mamutegosizupo.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/87891683792.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kepijapu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/aea376bdda053510ba380d768820f578/95315028069.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kafapitinuwexebedafo.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wimekezujusa.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/dogamibixetesor.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130765cb52a9---71485219943.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/jelalugevenar.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/funogevedepikegurow.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/doladog.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/87472666176.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ee15d8b4cd118ff993289c54e27554a/nuruwoduparumixoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stream+uk+drag+racePDF 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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 10448 bytes
SHA-256: 57639797e27e348529eecaa57c62510d532ea1cb3d8288b6e49d2b660c9d1c6f
font_01_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 15908 bytes
SHA-256: 7363d782e7f905ad8db6c0a3e01e7f1baf2a15e8a4580a4ac71bbe0bc8a4b9b4
font_02_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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