Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a209cb366feb404…

MALICIOUS

PDF

127.2 KB Created: 2021-06-25 18:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf6f3950a5903e3bb705cbde2bbb3db3 SHA-1: 2f4fdb81daef85f5268c2c7f95146e97c0e57a56 SHA-256: 9a209cb366feb4046d6e385e56c062a71e085b94ec363b69ec457bf850a7feed
156 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 file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://nomylo.ru/uplcv?utm_term=crown+palace+hotel
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a83931349fa---nawogoj.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb845c224e8---pogalubajo.pdf
    • http://clasesholandes.com/userfiles/file/xapamole.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b48677da---60470451747.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/540769927dcd65c11d8b13548b479d35/88214658158.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931d8a1b592---sufoxiw.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c04bbeb4ef9---naxudipapoxufegu.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/94aee1e4f1514543d9b40959a0a46610/70466241625.pdf
    • https://alshaabcoop.com/userfiles/file/wizefifisebifaxorol.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7edf2a945---62690887136.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/dudobokigo.pdf
    • http://lapenya.cat/imgjovesnaves/file/66247495482.pdf
    • https://acgroupenterprise.com/userfiles/file/23058911810.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50d56fbb1---tomilerivudu.pdf
    • http://markone-tools.com/upload/files/77225154166.pdf
    • http://allg-gyn.ch/userfiles/file/78962534235.pdf
    • https://charterboatdeliverance.com/uploads/files/73103458551.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd0204fd---gujozowetuzezas.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f082249a0e---13993917295.pdf
    • http://ipmarketing.net/userfiles/file/33047564318.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905f56a5ed9---libotonanu.pdf
    • https://alianzatours.com/imagenes/file/suxazosobulewimuzereso.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4820518230---romibabenepigilapib.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c24846ae8a---62473514218.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/baff28104169dd4f4a624f174acc7aab/63660340289.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017307.bin
fd5689167c17f3fc9586192b08e95c4b0ba819403bd6f7d1e4c0aefe0f36fd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17307 20212 bytes
font_01_sfnt_off0001a460.bin
146e5ffc46e77e4c0de1d0ece14674f6dd4cd316a4f9bef7388b11b5b27bcd03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A460 10328 bytes
font_02_sfnt_off0001bbb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBB1 16792 bytes
font_03_sfnt_off0001d3c2.bin
29381116f6df5628fdad40fcd2ecf50d5513756637e667dddbd61a0b0bd7787b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3C2 17280 bytes

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