Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2b7716c941e07…

MALICIOUS

PDF

73.9 KB Created: 2021-09-23 21:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae60f2fadb7255b09a877dce5aea8a32 SHA-1: b36a2f26efaca51d40ac94b0ae217ca63c75c813 SHA-256: a7d2b7716c941e075ac7c02d9df808d27b621684434d32a8a07e249bdc4046e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://adepotcustom.com/UploadFiles/file/20210918145036197.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/24792cee5b30acfe56880f351ed7d6b6/11181739471.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/gulukimizeles.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/baralazasegidipivu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/557454a66cf20349ba6629c37f21dca1/lupor.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/suxamewozaxareluritemibo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/69db480f493eda26a77c949039f74222/21765127597.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/mazinumaweruvekojowi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0430c4df---93603676807.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/tufox.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/77448175435.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/10129117887.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec42f01cb---dadejunexojuvexobe.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/sunisumudedijotevi.pdfIn PDF document text
    • https://auto826.com/uploads/files/garajotufusemupadodasok.pdfIn PDF document text
    • https://securitydm.net/slicice/file/14425983885.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/ninokojumef.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/65390283595.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nupepekubinugi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fuwazewefapo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb2b97b57---ronafigagedopefujaramekoz.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/1859542373.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/40577547989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ethics+and+law+in+dental+hygiene+3rd+edition+pdfPDF 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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 17596 bytes
SHA-256: 587db2bf85b45eb2a8affe66d4577131d51212850d2620415710289b7eab0a83
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11252 bytes
SHA-256: 14d55de75176bd85d280f4d9fa956642b624f44c3233c15445e4485bbacec913

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