Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd60ff65ed805db…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 21:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8a2e8b8afe8b3b1e01fe10e9f0f219cc SHA-1: d5061fab2ad06059484929d8b69fa0464ca4f1f9 SHA-256: ecd60ff65ed805db0516461474596c5e8dc2b6453b7e5fa65dc878fece9f80fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cructi.ru/uplcv?utm_term=free+movies+on+mobile+phone PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/v01e80754afhb53u3mh1ke01ju/39123781973.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/189cbb70a2566502273465f855fcb483/zubigujuxafuposopisufubo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/08c4f229c1334ea00449cab2e7224eb6/79243923613.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a6c081f7---50807266389.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073db5fc4f3f---21258733950.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/20cf9d759260680649fc3fc79d8687b0/45862269637.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/widixabiwuruliwameri.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/619b597f75d5e0d8eee7a070b0f7997e/fiporedowevedanu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kapuvegaw.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/52356024903.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rosefuvajili.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/6k65q2obpnmlesjb667pebb846/97399557199.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/90663969901.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/17584684846.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/82c15c54cbd74bd7ff835db599df3430/58009904771.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7abb42eee25e98c9849ad7e793387281/60258463167.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109be88ccfd9---22113602723.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0482711001620320837.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/sejetawivusubudu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ee0921e9---jibufur.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0c6cf1dc32e5e0be342da718a866e7cb/30383429123.pdfIn PDF document text
    • http://bulmarconsult.com/files/kamiv.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/41978876540.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10440 bytes
SHA-256: 0424786ba70fb20108bb4c1a5b9967d361334317ab3ed804c687fca8de40a261
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 18000 bytes
SHA-256: 0a9bbdf932bcb3534ca3806834022a3305a4418f35f0dfda33f8035cf98bfc46
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1