Malicious PDF — malware analysis report

Static analysis result for SHA-256 be05e437707deb97…

MALICIOUS

PDF

80.9 KB Created: 2021-10-05 04:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 491bc92f611f2fd1696ce0b0d44cbd76 SHA-1: c311b76456a429c8ca4e0f4d3183df6c6f4e6a2c SHA-256: be05e437707deb970244734d8e63cdd42f2250dc1f868fbd552594d950d035f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=quotes+about+loving+being+alone PDF link annotation
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d03f92e47af893304d6c6b34d31f50c7/nogiwibibimezari.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/41549128703.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/kapikenupufixumelolupu.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/48536735573.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/55ef467c66dcfa03d3b4b64f11c6e880/51763505562.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/24063578564.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/81478281805.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c0d667dd---99971585061.pdfIn PDF document text
    • https://heyratacademy.ir/file/sabor.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/64621180526.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/nulavapozefawav.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/digabidubi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xofagovete.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/wodavatubap.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/supumigovawuwipuvixo.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/luwatuzujowaresufabevon.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/74918496886.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/mulumirujupibad.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/lasel.pdfIn PDF document text
    • https://petala.gr/userfiles/file/88498595953.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d02d0583---fonaravofovop.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 18720 bytes
SHA-256: ae347550a81150840caf219fd85ff0d025a9a70c95a3161e1f1e90e13c51bb16
font_02_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10548 bytes
SHA-256: 0da0c9c3b339c3b47bc03bf87b378ac238a23df6ba86431807712d395ffac433