Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c4c15a1a8a2067…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 21:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 09f7cba47a5b37ffd8fe1fb8495edbc6 SHA-1: ade98eeb31f7661eff60513ed035c6be9107a2f2 SHA-256: 10c4c15a1a8a2067998952687689c3f8b1268a2607310c2cc08048d837f37fa3
96 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, many of which appear to be hosted on disposable domains and utilize common CMS vulnerabilities for file uploads. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to lure users to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL targets are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=i+have+finished+the+race+funeral+sermon PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838e71705da---kopubikosov.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c9fa7fad---zuzalufujib.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d0d9e4606cf45b6acd9dc9cb89a66f70/gobon.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8109561574---81320365393.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810dd048b13---12024724850.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f7c02a53---13568159275.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48bb2cf07---vobegeri.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/33767126287.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1b70714df1fe653aa4b8c6f111b8341f/vitosegabifuv.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160828ddf8fcdc---2254904515.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/63771132591.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/smts9jegueevrdgfejkd0s29g8/jepetu.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4d99acf84c8ab8bf7632cc2c96897de5/mufizorekaseka.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/66259811373.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/davekorapojidepa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8eb8b8ae---22236462427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 5260 bytes
SHA-256: 9a1ade5131f0c3db1c77f7da155fa1573baca8096a01428adc0186bec8d97cad
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10300 bytes
SHA-256: 24ad0f8f3e4c82bf15c4096da50a46ba5c2022ca787231c02ebd94cee5d1f9e8