Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d9ca6b90f5746b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 02:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3aa180ff238f72e229240611d0bbc12 SHA-1: 7b57c298e149f36fd719fd1587d364161480866c SHA-256: f9d9ca6b90f5746b247235fe2fb41a2e4b7d2bb8b600b3554a62f07305ff57c6
154 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier suggest malicious intent, likely for phishing or distributing further malware. The numerous external URIs and compromised CMS upload links are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5970

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=homecoming+city+of+heroes PDF link annotation
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2e81dc24---gejipugagodajakigedibita.pdfIn PDF document text
    • http://herve-coiffure.ci/files/84846512786.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117d704d0bbf---4775471016.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xofepibare.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24488c147---giwobeliwarifi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210609_B1487D0694F13B73.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/polujulanax.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/dabitigixun.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612517990dab9---94192064695.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sexusederomuti.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/43091029077.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u61frnpjd2k6194s42q33h6ru5/42390693081.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zurolomeketozemijizarizim.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/11845791448.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/13621892576.pdfIn PDF document text
    • https://tomas-music.com/contents//files/kulukofatasimedesimisiraw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160da2c6ba691d---ganamelusitudizidenakuxin.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160848a188b0ba---15315940773.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/1863244663.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/popaxivemi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/96878309010.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83501608385.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d02c6607e---fiduxugiso.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/19286960228.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/33801607858.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_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10680 bytes
SHA-256: dc1d86fc6d101ac458948ccedeb405377b6a31140d86282489f84d9d96845a50
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17316 bytes
SHA-256: 13b1887a8d1c6510c9c9b52deb48a2312f390139487e3fad55ed92628465da0a