Malicious PDF — malware analysis report

Static analysis result for SHA-256 0532382884c6eb27…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d9370782388857495694ef4a0b57cad SHA-1: a8801539b13e824478a2f4c3aec0ffcccce8ace8 SHA-256: 0532382884c6eb27b80a13cb2f24c8c2edbdcf6c13438f7caef3ad2362945557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=a+haunted+house+full+movie+online PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94d0d2d85---49023567703.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/82975647230.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/pajij.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nanob.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3ddfvu0pbsuouk5j28u0j1o9f5/pufimenotejekotelusewunir.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/66543255009.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fefino.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/10338607156.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/wawebupibunugifipelut.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/34478557545.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485b22d09a---sorowokotujujesix.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/68982918483.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5de1da5c---sovugefamedoledatomowa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3df66d28---90304105032.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202198144930.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/85705629288.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/pufominepadadadebagizew.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210902124636.pdfIn PDF document text
    • https://medtek.vn/storage/file/muvovobozakalevaj.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/51583686514.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/sekifagopirorinakixabige.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/poreta.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/53483161849.pdfIn PDF document text
    • 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 17120 bytes
SHA-256: c67e3306441044cf9c303f0d063834b1165f076f289a708b73031bc535a4c008
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10664 bytes
SHA-256: 9f8f0f52fb23ff05ed97203d4ebff28e093e6672a135791660562a62a59262b6