Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59bc8d4a42863b2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 08:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a5ffa0afa04ad431b24915522e2fe03 SHA-1: 9ce6b95367f191bd2967cfe2360a5271623722a2 SHA-256: c59bc8d4a42863b252fdad86f2cc910a7a67858a13826de81bb54063687ec04e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b1efn7u7bkpun7ersqtf9ihnb6/27837568818.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7555583d6---gigexubune.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/11726813810.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236e747cd97---22004864061.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/42609397943.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/86429581638.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3fit1boagu3g05puqqmfjak88k/35788276275.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/65686624065.pdfIn PDF document text
    • https://t2sc.me/userfiles/43387917167.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/xagiwojakab.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/67685518251.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/79687a9614218e83135d18334a6c0aa4/funitudivorusobowolujegos.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5440d6d3f---rejalov.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/28612076677.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/ratur.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/33366c41aae5c5c4f09cc23ca70a3d03/95085110070.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9cde5b8cd54f30b41ece916f6d842583/xopuzexujupomopifi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb498ad049---dimokorusetakinadadu.pdfIn PDF document text
    • https://viettrungson.com/media/Files/somovufuvezemoluvem.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8921d3dac5fd115919025ce1a91d15ff/5392252820.pdfIn PDF document text
    • http://isvpro.com/custom/files/guwebabavomofiwuvota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=in+another+world+with+my+smartphone+episode+9+english+dubPDF 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_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 11400 bytes
SHA-256: 2dec12925cb7459b7bcbbeba65927564c8847b3a40cf58c7d19b37383ba71391
font_02_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 20160 bytes
SHA-256: 18c5eab24c5c5126a70d5b9242764e5e57a6d5ad593a7750a16e2bc7383d0ca5

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