Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c14f8e3cf17c17…

MALICIOUS

PDF

109.7 KB Created: 2021-08-21 13:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a72835b411ccaa0c4c18049f128cbba0 SHA-1: 0545c53d9ab14172b852dc7a94ed92eb9c775e1a SHA-256: 83c14f8e3cf17c177fa17eccce8ac05f586a821761c6f81559152e4ba569c893
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files hosted on compromised CMS uploads and disposable domains. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://all-new-wow.com/upload/files/sulonerofulemilen.pdf In PDF document text
    • https://kingcarmotorista.net/uploads/files/xixupu.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/gopabozamuxesizeketitamad.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/98409184589.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7144a6f5e5---23215429000.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bd5336463b56506e214af4588780a2ff/tosigusizosimetifuzim.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/kizigasejiwutopenap.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6df8a4ac761eb38b3be0e06afcf7ad0c/rejogelomefikubatatado.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e300af133ab---jisowugawolusixewopif.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285dc6dbea---tiximobedenigowaku.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0b592f5e---kajukewawedigekinamoximod.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/96551840122.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/342247e75a1777eb08a8fa1f4d489408/wufanoloj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vqmkreco5noj6bteov3hgleqe2/mumupakagi.pdfIn PDF document text
    • https://equalland.com/uploads/File/sawoduxanigujenanatepu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/2152538422.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6846d4e77c---nizipoto.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/dimafenep.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd20c3dd58---nejupilew.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d2aa64f4f0d30e815234eb760bae434e/xanowedi.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9ivouo0kqi2baiffi432tnm3bg/fudewinopaleg.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/sujugojuxujapowijidavo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/23560118081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=suicide+squad+full+movie+download+in+hindi+480p+mkvPDF 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_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 11660 bytes
SHA-256: 5da5cc10e89b4d623b87d1d19e47010631a3eb02442d57d82df4dd67e9eceac8
font_01_sfnt_off00015ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA3 18636 bytes
SHA-256: 774b44a007f41651bc3e508fd0c6f199349e14cfae103c5e238bc324bd6ce444
font_02_sfnt_off00018ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1