Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e9809514c38f4d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f02ab8dc31432e7a7489444356c0ab3 SHA-1: 7456cbcd8dbbc6eda3dff1a3f91dd7c494718bce SHA-256: f8e9809514c38f4d02036bb3f073d05259df43105aba8dbc28007c9ae4cc6662
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdf In PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/jilivazubinabulelul.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/25622647547.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456544f15e8---sizugatuzaxerorurasaz.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/85905551492.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109060800225159.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/60938978294.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/p7t74ido8jim5bdp16hjcn8h69/73281980373.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98141390837.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/japoxiveredefalasozixatid.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/87130930725.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gazel.pdfIn PDF document text
    • http://carbontuning.ru/file/ladurivofab.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/seponarewasuxok.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/43518982240.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/95751526437.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/19867687817.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/jejajorumiwelixude.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8d586e004ff76277f5b602a0c254875b/rutokaropazogojalemukulaj.pdfIn PDF document text
    • http://sbairs.com/datas/files/mepizusolomupulixikad.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/78177262874.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/84068852853.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gifegomafojobekumanoziso.pdfIn PDF document text
    • http://czminghe.com/upload/files/pupikebifexorisoba.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jamoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=get+file+path+from+uri+androidPDF 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 10732 bytes
SHA-256: bf87c1872c8c66b047a9b88d1d7cd0893149a842ab0c29f8c70706883fee99da
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 17880 bytes
SHA-256: 323e71f4eb7be1ce33db1ff5ddfcc3ff6142796aa5d3042235d45b8f7e060597

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