Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9975e799808b4ac…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 03:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f0274b419353d4ad5e4887add2d6b6f SHA-1: 80a76f8a524a45d70072cc9b4ae23360e984ed67 SHA-256: e9975e799808b4ac41435e4e0e4855ebe7ae32063b3894e6a87d9c94cea72621
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/399b8c0e5e4f61d18ea6fa8610d42c6c/zifokokorav.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6acd05d197d73095622d5e1a6121ec55/duxiroruzorinipebubuwipat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e5ed05e1---tiviwifizafukikiv.pdf
    • http://scan3dsaigon.com/upload/files/dovok.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b6431a3b7edb853acbd858600ff792e/5407614992.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95d66e8b8---60670878935.pdf
    • http://anhbanglaw.com/userfiles/file/fenigoxafokixap.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c77a978ec---77510734779.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/48463079304a20ad7321d409b0fa3855/30194019443.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe1cdd823---56515333572.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/jetadipi.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mt9af1eqbm1ol9fl5q714l8dpe/95861819137.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6aae7b27b552f1b8107426f659a217a0/bomabapinonovej.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45f024458fcc0ed9f0a0786221a5265c/zesiliz.pdf
    • http://tai-yang.tw/taiyang/upload/file/gegirewarenenoru.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4872021ce49adecf3a8f5c341847df74/28266681675.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0hbi79129hln5qri7sunjlefqf/22057017885.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cdb9fe9379f049eda10ea099bfccd889/28836908063.pdf
    • http://aurora-c.jp/files/files/81247489344.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6a56889c0d47c484571bbb9e876e6ad8/45247917634.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5b9696d2---55703795208.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nq30enf8irc1cu7hc2f6jajh19/xofetira.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95c51aaed---26107509530.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93fbba8b81---57049250874.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ride+on+bus
    • 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_off0000ed43.bin
4a77c0beb960ebabbc3aa1914ebddbefddcbc2c9041d678e941a14b19ebd355d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10120 bytes
font_01_sfnt_off000103eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16792 bytes
font_02_sfnt_off00011bfd.bin
3a3d60e431fe60742dbe284174c87c75d92bf45e81e9f764367002f0532289eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 18628 bytes

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