Malicious PDF — malware analysis report

Static analysis result for SHA-256 0550267b01c4499d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 22:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff148d33daae2a516320d8c7b97c84da SHA-1: cb6ac54aebf9df074eb06211da89bfe2c48ae2e0 SHA-256: 0550267b01c4499d6fe125e6e577dc2e848659626d34a48ce4312c634ae3db42
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 link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609faba561a89---rijowasaretedesodenukez.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/namog.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/99919354136.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5lkcamg1q3n05ac61pn47afv1/nulilobagisanuta.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/pekavijikenozu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fda03376---ladogiroka.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/62899878514.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a655649b9bdaa793bda9cb6c9869146c/24830776246.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9556912fe166734863e6a998e9111044/rotapujizelasuroloxod.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b077099b---zofawilap.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tamimofevavegokofuxomokov.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094495632a6c---jekomefip.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jm798grc04ok22daqrfnrjqhl7/waluwodukebum.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/nilireweferarujipudorofi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95798937003.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/1501608950.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mopeduvor.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/xitijiwetobutuguvozu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/64095550808.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/nadevobofuvejubi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b1ccbf18d9d4a441ea5eba7a0e2e5d64/migadelenex.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608137ee45e0d---resokadakid.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/76522496327.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/dagenirirakiniwulevino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=newborn+baby+and+dog+sleeping+in+same+roomPDF 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_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10956 bytes
SHA-256: 112549b0120bde30501a100e5ad5ebc8c880217efd05ae0a070a4b8cd0d7ee3b
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 17396 bytes
SHA-256: 4027da624adac29169f2920ac55beed31a2e7f423f6fe5f5322a516bf13f05d4
font_02_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1