Malicious PDF — malware analysis report

Static analysis result for SHA-256 835524de61a9d527…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 10:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38b36c44ef99b2e1810825f9578e58ed SHA-1: 50310f4aa80356c4048a78abc01c8ab5cc973c3e SHA-256: 835524de61a9d527f10d821750d533120931790b87768cbbaea1c71e77f85c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://meimagedance.tw/ufiles/files/sejadoseboselenoledogapak.pdf In PDF document text
    • http://canissapiens.com/images/uploads/file/fegorevemisoxufemupo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/gabewivedasosepixawevag.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gavujobijejisex.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/fuzasebumer.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2d049c5e4e244c260c58845f87513418/88320356736.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zumexikiterubepubokebeli.pdfIn PDF document text
    • http://bakoca.hu/files/file/48379044732.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/91131723373.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/1855175218.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/revogitimozoro.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161311ff212761---12987302021.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84253507118.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/85329909935.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/xojupilatavifewoxifapik.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/76655702334.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/3272723057.pdfIn PDF document text
    • http://philboyd.com/51751562853.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/32805459058.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/53138882312.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fewujojedaxiw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a89e1b18---47416220148.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/36516089538.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/55636457626.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e819337864---58443228671.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kipexotoxor.pdfIn PDF document text
    • http://willbramephotography.com/56285967733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unable+to+update+chrome+and+android+system+webviewPDF 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_off0000b62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62E 11292 bytes
SHA-256: 3cfcad4ed28243b94c311a327797f0d864a286f09dcd7a4afeb68200f4de9d1e
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 16308 bytes
SHA-256: 20b675153baf0dbdc3e79f33b32a4158d5c112949b51dd19d0b87ffde3fdd225
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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