Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f78ba6733cc7cd1…

MALICIOUS

PDF

100.3 KB Created: 2021-09-11 13:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 080cff5b58d12a7415b03a17e35bff7d SHA-1: 0efb0501a3430be041dd672a3c8c8ef25b7ef7c1 SHA-256: 7f78ba6733cc7cd1656479b785b397b59b65692904acc6fcee3e9ae2c9059a9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://manavpublicschool.org/manav/userfiles/file/57765090643.pdf
    • http://salon-urody-bellis.pl/images/file/35249014735.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc51bb3bd---3315420783.pdf
    • http://campingwithconvenience.com/files/files/ninegorifosines.pdf
    • http://riggi.ru/userfiles/file/16253916058.pdf
    • http://888spirits.com/userfiles/file/3963281720.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zenew.pdf
    • http://creptiles.dk/userfiles/file/72853174253.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/21454062506.pdf
    • https://grandplaza.bg/uploads/assets/file/902758194.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/de28e4245ec66f209d9b329ca82e8c56/8032078067.pdf
    • http://pcccphucvinh.com/upload/files/97022505564.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b7161dc4---15695181014.pdf
    • http://tavaszitura.eu/userfiles/files/53763707884.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131617bbf5ec---tedupekupoxelorebibu.pdf
    • http://capitaldanceacademy.com/userfiles/files/54301776828.pdf
    • https://weilmclainboiler.ca/fck_upload/file/levabakemisosuvuvuwesame.pdf
    • http://ccsilver.kr/files/fckeditor/file/922631694613034511cebc.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/70803508423.pdf
    • http://pascalparrot.com/uploads/assets/file/45366933849.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135be8f1dd94---54916831989.pdf
    • http://benetalent.com/upload/files/47280904672.pdf
    • https://ljlconst.com/admin/images/file/11481217178.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/c5tonqkh2co62pd5fkb1uhik85/39782126437.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=build+prop+camera+2+api
    • 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_off00012242.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16792 bytes
font_01_sfnt_off00013a54.bin
f3cf6e9e5766b0caeca95a46a6e1c48d8ceef7f483096a336cb98328b23f1f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 18724 bytes
font_02_sfnt_off00016b47.bin
bbbac3bd976c6774c876a7ac1a48b220ca56e99ccec4930e036c7d9a24ce559c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B47 10576 bytes