Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9277ab258e46820…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 23:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc6c6b3e81ed6d5d239d2941345398b8 SHA-1: b40e84a92f66033f292975f85bc7c9422d5acc05 SHA-256: e9277ab258e46820b9f5a47607dd7891388d09c808acf14841c65fb777713c02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://rescue119.org/userfiles/file/nevumunipexenunejadu.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780a430c68---loduwozagobisowimekifefi.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/gevasofimememanilori.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vutiz.pdfIn PDF document text
    • http://cke.hk/userfiles/8620953178.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/fuzoruf.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5ea18263---figomesud.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fukasobironubuxekuj.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/nizadujikur.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/vezoxanalexetarediteguwef.pdfIn PDF document text
    • http://kite-surf.sk/files/75654668281.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/40367634231.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rololek.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/70680277619.pdfIn PDF document text
    • http://holzweiss.at/pajomovojakan.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/mowimozalo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1b15a93e---wagubosizerabusekeludenu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tipevot.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908101021763064.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/xiruw.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/11655818929.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51826088510.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/82240676944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=my+hero+academia+one%27s+justice+2+download+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 20908 bytes
SHA-256: 213124f6ff157ad05342df2c7db542e5e982d4545aeba43a03a7d3e5b1722c67
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 11212 bytes
SHA-256: 9af39a2f581d048c98c8206af404b4d13a9a8fe321cfe0fa0e890f56fcb2c5d5

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