Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b2c8e753fb158f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 04:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 93f30e9d500271c8c0d2f5da72735193 SHA-1: a5962b956da5f18e4950119e6cdecc0a4a01a40a SHA-256: e1b2c8e753fb158f4ae9f2d3570a6ff73861ba3f1719b838077a6d203984d533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF download links suggests an attempt to redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ntct.dz/ckfinder/userfiles/files/midovurolawixovakuzevuf.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/fabalaxexeji.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/jagobeledonuvajos.pdfIn PDF document text
    • http://4bx.pl/public/file/peralivozigizinenagigawi.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/66375425183.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/83048674301.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/liletug.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210913172947150.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19854497767.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/47133896565.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c46f6dd324---desirebatumaperekep.pdfIn PDF document text
    • http://grandfiltr.com/files/file/93959317201.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/20135982894.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121044567135.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/14229877158.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/37661465866.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f3e2de6d---39097876556.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sisavuvapipefaku.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/kajotew.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/37653581374.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/luxog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88d00049d---79471658903.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/61429752856.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/15660545433.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/97110799002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=real+car+drifting+simulator+apkPDF 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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 11200 bytes
SHA-256: b5776988e84fecaf69337bf3d430de7e3f3ab58e733466c4397c85c06f003b53
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 19676 bytes
SHA-256: f00caf391e88e61ede3e768964f5e00174e7b541d864f733f6f50cd8b8e0350c