Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc56f2f6c327dada…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 05:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49ec575b21fa4a3a48d29597f0f090a4 SHA-1: 5601b2b8a33f55c8831ab711870e1c26d472d504 SHA-256: bc56f2f6c327dada130d8a26444fb3e356105d20ec1a86e531018bd77edf0c27
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.radanhorse.com/resource/files/61791139191.pdf In PDF document text
    • https://acrgruppe.de/userfiles/file/kejitusitesarive.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0dc6a0d---37134080499.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133214b526c8---78575617495.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/15473355473.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/rumarigikexulebasimalijon.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88931914979.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132332ea340b---33378083547.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/14642750574.pdfIn PDF document text
    • http://thaide.org/userfiles/file/wajesikivos.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/nujoxejozosulonotomem.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xugodofoxinojeko.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36a3ba3fb---bapaw.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/65704328276.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/75524478626.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/zikina.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/kezin.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109130523464158.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/ziparorenitideweverob.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ebe519c9---14974210680.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9400212231.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/sajemotope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=all+chords+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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 10112 bytes
SHA-256: a369ab7704c6f3987e4ecf148a1868da856071930c75cf2a755ba818d6758755
font_01_sfnt_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 16960 bytes
SHA-256: f7dad6585f6224a7bead6ca7ccf7db86356db51d6ff54535fc5ac4f3ae785720
font_02_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1