Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ac1dc95516ad06…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 09:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a70d0f0bbf073b0ad34ccdb1c35af66b SHA-1: 88dad01f256f984ede3dfc552c3f191c5cb64cdf SHA-256: 28ac1dc95516ad061fe84497e5a7414a70dccbb556df54c7cba2ef9f325c9389
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, hosting numerous links to other PDF files on various domains, some of which appear to be compromised or disposable. The embedded URLs suggest an attempt to lure users to external malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

Heuristics 5

  • 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
  • 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://chingyi.tw/userfiles/files/ziborebifujokon.pdf In PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/46428873931.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/75991753394.pdfIn PDF document text
    • http://drtamerturan.com/file/tigez.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129613d4a077---99193415128.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/tevex.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/44749923791.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/22343723682.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ba7f29ec---rijimamavulilesikovozu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f293662cd6e7cff59753697a2815df56/damomenunugu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a4f3dfb7487e2b1b53c4604899582c4e/19515837320.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/u2mlv41gat3ghc1dvcrrpk3it7/tesilokebogobose.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/10481457324.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210903_7ABDA00D177D234B.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d7323eaa38---wibavudenuzemasafufofi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/jimavesurunizodaxumevex.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/60257619611.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/sejifuperapoxaxamopedivur.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/96502806022.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b78f01cee---fazakexedisoxupebunavuza.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/40733157859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=importancia+derechos+humanos+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/96320082579.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 18404 bytes
SHA-256: 2b0c787ca575bbf4d0b8939afa034f27ba1681b643c3b40ef6ed20898df40e50
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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