Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bf42d9446b14e0…

MALICIOUS

PDF

79.5 KB Created: 2021-08-14 04:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f70c92a9ec343ede8e16305ff4b7f5d SHA-1: 639956ee311e317196db8720b6380f85fca2967a SHA-256: 34bf42d9446b14e0e2432a559e0688f5965aa1d1e47dfef11f05b4fa0009bb80
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to malicious content or phishing sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a536667c527f6ee7108e4c4b9a888c8/bikebifud.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/66096705606.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ivig35o3gtog8m0lb73h3eesqh/vetenadafusadagekavote.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bc4ccceecb79eb8cb7950ab5615a1cc3/21958843861.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/14392180599.pdf
    • https://hoalavender.net/upload/files/kowonubekunorelibe.pdf
    • http://goddesshair.net/upload/users/files/18180340688.pdf
    • http://www.annaleehuber.com/content_files/file/9485959004.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96fe931e8---zesokakol.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610d633b97242---88007168471.pdf
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/48473992397.pdf
    • http://ccspevents.com/clients/24998/File/83631934499.pdf
    • https://danielstrehlau.com/userfiles/file/zelelar.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210714_D9F7355E4CC32F72.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/46483838394.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hsi6gec3o1881brg7gmfrki9fv/83120863034.pdf
    • http://zdravi-kromeriz.cz/files/file/xovopuxujikogetodetepu.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/754a7841456a510bda06d4d829bb4fd5/66685856476.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031b617ba6f---gorojudoz.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/gidediduwiraxemenojonoxi.pdf
    • http://sacoorhealth.pt/site/upload/file/loxeluxafob.pdf
    • https://dovolena-jiznicechy.cz/uploads/fetegurugepizajis.pdf
    • http://3wsystems.com/shipinc/userfiles/files/55015214021.pdf
    • http://diversecityuk.com/userfiles/file/61568006458.pdf
    • http://hawks79.com/clients/85064/File/17329050215.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+twilight+saga+eclipse+full+movie+in+hindi+download+720p+openload
    • 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_off0000cc9e.bin
a82a184d4f8720abcdf6dbdcd3c1e983f03687685b771d5a915581267d38f6c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 17060 bytes
font_01_sfnt_off0000f997.bin
8876d606bd5b9c2abcd818bf52baa09b019388d90e5279864000c296fe4e7021
pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 11476 bytes
font_02_sfnt_off00011481.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16792 bytes