Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0a43db1c8a3dd3…

MALICIOUS

PDF

89.0 KB Created: 2021-09-21 10:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9442b04699295875dcea075d1cd4b655 SHA-1: 4477be1135898ffc94d9fa05cf68f1944c282ef7 SHA-256: fb0a43db1c8a3dd3968dd5b3b7cd4da8269e53bbb3e606bfa31880e2d7fa7071
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://mapect.com/upload/fckeditor/file/nugedoga.pdf In PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/wopufogexegexifupizo.pdfIn PDF document text
    • http://upakuika.com/img/file/legokogo.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210920_221723.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8042ee1bc3c93a72d98aaea4fe1fc82b/beveza.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/12055782679.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/19268211773.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/44064319408.pdfIn PDF document text
    • http://momsystem.ru/public/file/bifavazibenabidipafapasu.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/japimojewilero.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/pomamidari.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/diwobapojumulelanimoto.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/67600815762.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109211241384831.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/sowurabirobovopedodojukob.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/13843304898.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161353fe789a39---vagijuxabetezamoxikus.pdfIn PDF document text
    • http://punaide.com/userfiles/files/83825025209.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d670ef0ca6---sokovuvugakasuw.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/82940832411.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/gojulozigivi.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/juxad.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/damuwoxasafetiwoxubu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/11192724364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+work+it+movie+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17520 bytes
SHA-256: d135bbd74f8bc4f95095966d38e3914a0b606c18160fb6521c88f4f72c5cdc4a
font_01_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 10564 bytes
SHA-256: 6a41927f2de31dee3f65424d88e2f70b2ea8323b5904b253a736d2fc5c192927
font_02_sfnt_off00013e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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