Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b190a9dfa652a18…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 13:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52d4c2edcc37ebfced5c8fd39042ed74 SHA-1: 90de02319d6e6fdc4b595ea0131e24c085593f97 SHA-256: 1b190a9dfa652a183ad38dbdd5c88bf815d81ebd13804feccee750e59c859311
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a malicious purpose, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=can+i+retrieve+deleted+photos+android
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417be666d27---bafove.pdf
    • http://bassonconsulting.mc/userfiles/file/meziju.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/3171228007.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613598eeca33e---59339949457.pdf
    • http://gidaero.com/upload/fckeditor/file/tezesapifobinebafufa.pdf
    • http://staractivecollection.com/resimler/site/files/balebilinekenit.pdf
    • http://forglass.sk/userfiles/file/vewipopubaxidu.pdf
    • http://drentmedischadvies.nl/uploads/files/xagenogakuvesazuworeluw.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/texikimage.pdf
    • http://phubozena.pl/userfiles/file/62520347106.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145547fd74d6---86815612895.pdf
    • http://dycelife.com/userfiles/file/78315245942.pdf
    • http://chiari-web.com/ckfinder/optimist/files/puguzejideja.pdf
    • http://ehoron21.mn/uploads/files/pubuwimofitupobex.pdf
    • http://hbaoge.com/upload/files/22623806813.pdf
    • http://kliknetezde.cz/admin/obrazky/file/naxiniv.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/kusorewukivowejegaxapebaf.pdf
    • http://ventima.ru/userfiles/file/sonomurat.pdf
    • https://habibitours.com/ckfinder/userfiles/files/lupakasejugu.pdf
    • https://linhngapt.vn/upload/files/81604334364.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/24889887933.pdf
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/jafebokej.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16792 bytes
font_01_sfnt_off0000ebf9.bin
71ce08b4f4ded977f63725aa1c5bc51b0aef62ff6d6a7c4b49f9355bf9828b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17016 bytes
font_02_sfnt_off00010503.bin
f69c030b030f05fbb50628a3e2a635d38b35748eb2f81bfbac18ad6589a06a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10588 bytes
font_03_sfnt_off00011d1f.bin
65915cdf0ab653d4d18b649b5375496ec1f83a724fd170039b79d431fded1768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 18408 bytes

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