Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea30106c3271a9e…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 22:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82b10332838fe6d5843d20b7bbf2fc5a SHA-1: 1be5e5a27ae1d2d9e75ce739cf47ccd3cacd4bfa SHA-256: 8ea30106c3271a9e5eaa8cb030ec03e16fb756032b989f4bdc5226b9fb93ad1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the link farms suggest this PDF is likely a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=854+divided+by+7
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p36gj7us1gchsmv4sm430pusp1/begoditi.pdf
    • http://akinmedikal.com/uploads/file/lizumawojigemubowuva.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaf66da3ca---62758086076.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d918f07e34---46092416787.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5b0e1e5a---41509030387.pdf
    • https://aawyx.com/sites/default/imageuser/file/zetita.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2bea43a2---51610288109.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7c81f081---zamurudeworumu.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vubekufujolezol.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a945989524---6543676840.pdf
    • http://suachuaspa.com/upload/images-content/files/40601981633.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad4c402639fd3755083bcebd194e8fa1/gowasomiwatotugo.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078acfa41ff0---89575815792.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20334b591c---vufuvazoxewaka.pdf
    • http://www.jindatunnel.com/up_files/file/dikesesojowiso.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/2894fdc8f4d6ee1abf08c15472644200/pasowiga.pdf
    • https://limsurdua.com/contents//files/5193186260.pdf
    • http://bidmitt.com/img/files/file/44847356002.pdf
    • http://macautemple.com/userfiles/file/xafagaweb.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0v6v4tmasi69ee1nnuh3opjete/gosukarejotomonelibusak.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d5b1ad5---lezadipefukeguweworinitol.pdf
    • https://sunnyvale.com/wysiwygfiles/file/4796356235.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ad10a8b2d---fanulinadunukew.pdf
    • https://tonwen.org/userfiles/file/28732389345.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5vd5lvl942sefb7a508n38m4lk/mipawogamilovosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e727.bin
e82770af4dc043446eed0f13b08f54d1bf4efbbdf9a73d92536ced51a7b7f535
pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 18856 bytes
font_01_sfnt_off000116ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 16792 bytes
font_02_sfnt_off00012f05.bin
78e79706bb0fc138e16104e13614014072116eb5370448b3170c99148ffdc7fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 10136 bytes