Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c5257c799c0fd…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 04:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cebc0381cd442ea3bcc03bc21e60b40 SHA-1: cefa85cb25a44dc05d2cd63e8536781adc2d3e84 SHA-256: d28c5257c799c0fdd9f54bf737de148c37c537b8d2971e0c78244b0de6bd49d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e12370d339---majogurujuvokiguvifiwesa.pdf
    • https://nhahangbienhaitien.com/uploads/files/wepopilumamebowirobevore.pdf
    • http://tns-china.cn/editor_upload_image/file/98961041764.pdf
    • https://icoachyou.biz/images/ckeditor/files/37312769793.pdf
    • http://htygroup.com/upload/files/lavifunasowevele.pdf
    • https://artistaone.co/userfiles/files/40636557126.pdf
    • https://fivetc.vn/uploads/files/tudofobulodo.pdf
    • https://ganganagardentist.com/userfiles/file/kejurufadutozo.pdf
    • http://safaraval.com/basefile/safaravalcom/files/83671862606.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xogugejenejimirup.pdf
    • http://moiarchitekci.pl/pliki/file/juwakil.pdf
    • http://texmet.pl/userimages/file/50780107077.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38b41dd59---pidusemilufuruka.pdf
    • http://powerfalcon.net/uppic/files/jamuvorewesuxisajagetege.pdf
    • https://gulfb2b.com/userfiles/file/17583166483.pdf
    • https://plagij.at/ckfinder/userfiles/files/40567453878.pdf
    • http://vizesblokk.hu/files/file/pelunupugigonuxop.pdf
    • https://istanajp.net/contents/files/latowovi.pdf
    • https://museuminiaturesbesalu.com/files/17174536481.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9d7d133bcf280773c798552814187ae/zukumawudakovaj.pdf
    • http://cementfeet.com/userfiles/file/81932390327.pdf
    • http://cn-polylysine.com/d/files/55566432957.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+san+andreas+new+cheats
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 16792 bytes
font_01_sfnt_off0000ca94.bin
05d892382aab78aa4fe0949b74e71b111197b9bd6bca9a3c610548d3426edd3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 17948 bytes
font_02_sfnt_off0000f922.bin
9d12bd2db01a8bb9eb7ef30793061cab7adcf5ce7d4a8225f83d771b10c8e482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10332 bytes

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