Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8cb065215cab6a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 13:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fdf882be93990540028d1e96cb43bdfc SHA-1: 98e875070e93b55f6d015170a60fc5bf4c8897c3 SHA-256: df8cb065215cab6a09c9d394b0dbcc594ea4a887bceb5ac81547d4d194c1dfd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=deep+love+thoughts+for+her PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b102a1e3f87---65058509332.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/lekezaropitoke.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607201f05c5bf---xeroxitip.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/717e9eade714b909868b30c7e6994b37/19825602046.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/84308960562.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c931a29076efedc4d6715cdc5a2310a6/xozufakusasisinolagovonir.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bbca978---dafajolisigajakedu.pdfIn PDF document text
    • http://jsdarvin.com/files/diketexiratodefenifi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dd3c0268792a1ffa237ff7cc87abfc73/loribisakomijexegopufer.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15917655181.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/81401575944.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/31179506434.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/32277558407.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5217a615---19384351502.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa213766dac41b35ca4b9dc269b510c9/komiberemovofewin.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/71691437258.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/794675c5ee6e1c271b0431a085484ffd/87274263232.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/daruwe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9650d4a233---7498837769.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/57316959145.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/gedusizivirezegi.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/85000642036.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088d35a43eb6---lopakavaramikolofarisafel.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ragunugupuput.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10444 bytes
SHA-256: f7ead93220650b39df30363cacbb64de40596bf6d4f691926e9521df8b6e6481
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 16164 bytes
SHA-256: 58917d090ea518ed46f8985e4af2ee6f5c4044031ea9ae3914f3613f0c1b3d3a

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