Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9a07b02456a6bc…

MALICIOUS

PDF

70.7 KB Created: 2021-10-07 00:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 429dfa41f864f7a6f99b0b2ebef659eb SHA-1: d7ce95ef9a25aac98c3de58db731429ec6a0f40f SHA-256: 0a9a07b02456a6bc8d9bef71211125238880af860f480d3000d3ef80e1eaef3d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, with several identified as compromised CMS uploads or disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The primary function appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4165

Heuristics 5

  • 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
  • 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://jysfh.com/upload_fck/file/2021-9-21/20210921065934947886.pdf In PDF document text
    • https://tmtteks.com/files/foxonimokutijogijupigopa.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/31432740458.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d8d4bd26f1a75da2938b24fdead2cdf6/xitibemawozezamoz.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/texibujunudotubiteregaw.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21965429044.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/selolifusamafurapaz.pdfIn PDF document text
    • http://chenruichem.com/upload/files/42203004857.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mujezazu.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/nuzofevulokaperike.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/refuw.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/83078649997.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/731647111614526c8d24e9.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/kozikemureras.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/44825723952.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/galebomevupojogug.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/musuvavowavonalifol.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/41576482419.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/bafasapafelo.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/7982124382.pdfIn PDF document text
    • http://lawngo.net/fckfiles/86102874050.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/zipusevuluvirolizujovut.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516ecd383a4---79675094064.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/66875548034.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab388288a1---vapitazinimef.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13753004374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+star+is+born+2018+full+movie+freePDF link annotation
    • 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_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 11164 bytes
SHA-256: 859aebdfc79b30ed5182351e46a05ea3ba87afe6f9491cc5d89e47a296a08a3b
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 17436 bytes
SHA-256: db78befc07eaed2dc8e4f5f9d381733234c505c8e788f82a09e12554ca0a3def

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