Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cefd708d993a5f…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 01:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60a227f0b1767705e50bade0c2a8884e SHA-1: 9735f76225cb6b6e1b802c2f5e779f79f7a73446 SHA-256: 03cefd708d993a5fa5c0a2c7d17a91c1983224f77060cfe53644e2635c602162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious documents or phishing lures. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7d755cb8---6293321075.pdf
    • http://thietbimaugiao.vn/Images_upload/files/muzopekiwanidaba.pdf
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/4317149229.pdf
    • https://gawwaclsc.com/app/webroot/upload/files/89878375858.pdf
    • http://veraschwemmle.de/fckdata/file/nebizeganejutuke.pdf
    • http://fine-cottage.ru/userfiles/files/24817697131.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607311117bd8b---42348239153.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b031ad0bb9---lazimawerapubofiwas.pdf
    • http://harchovyk.com/userfiles/file/29247291722.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bms82ame6nsgrqk2h67drjbjlv/xufuduruwokabukaxom.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078dab667930---gowamedopawinomi.pdf
    • http://fw-simple.com/uploads/files/silasizafuxotetidovur.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p8s95n29a1kqkdcblprk69od6s/vikozusazewa.pdf
    • http://brenno-tojestto.pl/userfiles/file/fiselevanopafatikaze.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c793adaa---12913801315.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/f40b58fb69f2363ee89104954a16d349/74479880276.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f989ec8c5---guwabaripozopigewe.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b826020b9---pubenajo.pdf
    • https://sfeerweter.nl/userfiles/files/raxekuj.pdf
    • http://obasekiestates.com/UserFiles/file/89724498415.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080373da2c4e---daxutorim.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531113140610542.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c3a97ae7d88955c4da0b6148185197aa/28850872067.pdf
    • https://atl-50.com/files/file/28839846607.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e61ab969a41fe43e662d4d9c99910a25/71851319270.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=a+pure+substance+has+a+sharp+melting+and+boiling+point
    • 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_off0000f6bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
font_01_sfnt_off00010ed1.bin
99d5c727620f6e10cea40aa415e3a9eee6cd1ec409cfec239e5c68da104f48a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 17580 bytes
font_02_sfnt_off00013c0f.bin
f138235712e2483e58900d0fe113ea9c5fc22383d8fb8a0b5877d066202b5538
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0F 11184 bytes