Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b48c5466cc4a2…

MALICIOUS

PDF

55.3 KB Created: 2021-10-01 17:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41b915278b9ea6519eff63a814d11040 SHA-1: e10cd30379282091b50615a8a98372bff4431894 SHA-256: 8c1b48c5466cc4a298f660408bdf72d6738d714798b874cb28d8ccd94d78ee2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7186

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://irlanc.ru/uplcv?utm_term=construction+master+pro+apk+free+download PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c21949abfda4e354b367ba74acc48d20/754771838.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/wukelowazek.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zuzugifekunipisoseden.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/jasofukirukabogefetubi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2b27d2358f09d9b6cae2284e0e433761/kixibogajebedo.pdfIn PDF document text
    • http://bociany.sk/media/file/66043029868.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/10033402040.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147179ee643c---55092102055.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zoruribusijedavizozurip.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/76451785.pdfIn PDF document text
    • http://belst.by/upload/file/fiduwefojazukevibodege.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912123654379.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gunanidekow.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/33572584148.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/fisakesapulisaviput.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613249495b305---sagiroxa.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/vizamufajovavarizusowerul.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/71574239352.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fusejuzukujirinuda.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/guvejerejababuder.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/6066753936.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wowoxuxaxese.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/34578056559.pdfIn PDF document text
    • http://boq.internet-match.com/upload/files/midedakifonig.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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 11092 bytes
SHA-256: 847bdf0ade79848d6995294c970335f1819508d06398523a4c74a2d8a16f8f48

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