Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08edc718950cff6…

MALICIOUS

PDF

63.6 KB Created: 2021-09-17 17:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f60932618347338b43994d291b79685 SHA-1: ed8987b26e580fd38b32fc7a76c040eb41c5bc1d SHA-256: f08edc718950cff66b1969d5464d93bfd80b0990f2265b6bd25fe2207fab0cf5
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to various domains, including compromised CMS upload storage. This suggests the PDF is likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

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 https://synerhu.ru/uplcv?utm_term=cara+mempercepat+koneksi+internet+xl+android PDF link annotation
    • http://sns.hu/_user/file/jemos.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/7433588852.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/podijisaviso.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c5d636d---26849347625.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/matefupaladetezu.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109172023231999.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f70d945ad209644090e6bdf71c865eb3/14367245055.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/dorudap.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca60b38bf---57722759688.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4aecdaec---mogewuramikut.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/nasatajevulitivagi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134bfbb57caa---nejawedununobedexazola.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/42e0f430c5338d2717877a8081a9e371/pegejemovafosugi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cfb19d051ac8d76d851d63c57456f49c/pawejemekanexev.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/35220248583.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137808d8e197---62718514452.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fijuragupemilu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/madovati.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/59073339425.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/44260043556.pdfIn PDF document text
    • http://nensi.si/upload/file/vixakegewiginenon.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/zasasuforewuxo.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/vateme.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lekasowelasakiwebo.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/25501273787.pdfIn PDF document text
    • 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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 15756 bytes
SHA-256: 201268972282d7f5498dd77d9e653185f13f2524bd053e7e9ee3ed96482874d8

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