Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f51e4f0f841c06…

MALICIOUS

PDF

139.1 KB Created: 2021-09-05 09:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efc47dab67181f52459c049fc6434300 SHA-1: f87e6e263bb7d68442d1ae1dea3b3c3a7ab0bf81 SHA-256: e0f51e4f0f841c06982b4011c52fefff1093decbec8fd6fdd06ebeea9233e89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161079e9476392---zafovig.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/24009206758.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/12400381206.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6ac4328d---75121647776.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/memunakij.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8198449305.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/65624413835.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2319fa4d37---libime.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lurexozelilogawulamoloxeb.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/17295851898.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/solibaxewagowaxok.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a000bbcb57---38904738429.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/6371480865.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pomebotexovo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/41978785021.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fb48382eb7c---xoxexefinifarima.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/guvopiwope.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bf23e8173---vutomaxuwezovatakali.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/46208956911.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/tamupajijirakowelu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/unsuepakcfakf9lr0vtsh141o1/juzig.pdfIn PDF document text
    • https://ocw.tw/uploads/files/65613293148.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i5e5nrfutvq6qfnfgt9k22f7p3/zuvab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ias+24+parti+correlate+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_off0001bba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3B3 19764 bytes
SHA-256: e31aa751e2c68022d1ed4322cc2b757e5b91cda9a04b8387b89e15127ca89ed4
font_02_sfnt_off00020607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20607 10656 bytes
SHA-256: bbc03af23e59dc9223a1746408a06f1de1581c1f54ff8b52b66b75bd32539a5a