Malicious PDF — malware analysis report

Static analysis result for SHA-256 15191ef5a318627d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 03:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf6ddcee0f856b53a19345bbe30b2bc7 SHA-1: 5a4301690fa33517eb0bc13ea96bb52e97d27f52 SHA-256: 15191ef5a318627dc49d2c08bc38c017ccf424b79184751abab9ccb0a6522b21
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5841

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://aelma.com/sites/default/userfiles/file/62571234259.pdf In PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/togamepapol.pdfIn PDF document text
    • https://fishboat.hr/files/94237599037.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/nejasadenelez.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bufivuzugutifukol.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/49954872058.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/224968611.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81994bb9e---mezijomegenivi.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/18767160712.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f8d3e9e80---58061433905.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/fadumujada.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109070010551113.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/96751897932.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4332b68f4---bagutekamawobatug.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8955658---39618698979.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wowimetunir.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/64772595240.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/vuwimujewatarulotem.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/pijamutunakerabizagigegin.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/gutasavidolig.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/76791195453.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/jojuritebamenala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+app+for+korean+dramaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 10664 bytes
SHA-256: b01149712431c2d840a54affafab15a14e2bcfdfe9eceae8725e5333f4406fa4

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