Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bacf037bd937e81…

MALICIOUS

PDF

62.3 KB Created: 2021-09-27 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c5c73324c42e9917b9b3bee032affe6 SHA-1: 45388c3751f9da78a6b59df7a2bdee42edf348d0 SHA-256: 8bacf037bd937e815ee548f6af3db227a320150e0cd9e38da4bafb392b4febed
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosts. The primary purpose appears to be directing users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8689

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/78319a8c79698dd3b7c21625e099c0d9/50691511197.pdf In PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/340360835.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced302369f---81739379509.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/mezafojipuwidipixesunega.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3ka1rm25n3ue0708jjdn8vh4fq/7974081585.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/652d99ae531aebc98e11bced934e6d58/labepasomuroxa.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/85903343275.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/32628635893.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/roxowetumoloxuwe.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109221816565394.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109210526046074.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090412311173499.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/zutibegi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/2868567467.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/52208014620.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd66303dd3---24717677908.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ac54cfb1cf3cce0649ef468c77f502c8/wiradex.pdfIn PDF document text
    • https://doitoutdoorz.com/file/oJI591me95VCI7X2.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/muxasaxefotokijegafifolo.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/84004498729.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134729d6fb5e---gotiwe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6b728695---tafibabamerenozufoxifun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+big+files+from+android+to+iphonePDF 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_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 11164 bytes
SHA-256: 1de9663ef1aab1cbce7c18731ab2022abaf5185e832aa1bba7b36b31a261632f
font_01_sfnt_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 17824 bytes
SHA-256: fc7cdcc1126f0013b8dee4ca618cfc5bf6edcef8a2bd075136ee7eaea521abd2

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