PDF malware analysis — malicious · aa8ac324fc5e58d3

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 842d5eb772d48f23cdce5c492d524eae SHA-1: f0d20db27a18ead7df311e12dcfa0be7182d75e1 SHA-256: aa8ac324fc5e58d317dda03abd4c1c29de4aed3601e4c63738d6021ecd2daf75

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to external malicious content, likely for credential harvesting or further infection.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=presentarsi+in+italiano+pdf PDF link annotation
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/52980ef7d79a96de0ef09f181f9f369c/64876445490.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3caa6340544e4b966e994b81732552b7/88060739960.pdfIn PDF document text
- http://z-sinpro.com/upload/files/4538475023.pdfIn PDF document text
- https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/531670006737f26c0c706291b6582627/sijoverudiwiwesadij.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612195145d875---wokugelalijalaxuto.pdfIn PDF document text
- https://lifetides.ca/cambridge/uploads/files/zuliduledevevifetinupabix.pdfIn PDF document text
- https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa1a0c4aa---11961477447.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b47cd1e4248---63022143704.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/18cec6c84779bca462307347031cd1e6/riwuvesifokonulifodut.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/xerebajo.pdfIn PDF document text
- http://renovfab-menuiserie.com/userfiles/file/14097731356.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3b1ad7cf9f5cf4048cd0e45f94811468/47023581864.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607667a7072b6---vefeso.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608848487a5e6---nozemuvezutifozudotaviwe.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c2654dede73f8eaa81d5c2a613720215/7470943239.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a3c2cd7eb8beae879905b4bdddfa416d/66882878876.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078daeeabb89---6531677648.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254fc12f9ad---walomuvobofiludamo.pdfIn PDF document text
- http://longarmquiltacademy.net/fckeditor/userfiles/file/lerototovibovaledoruposot.pdfIn PDF document text
- http://matras-devison.com/upload/file/59664034100.pdfIn PDF document text
- https://ltes.tw-goods.com/UserFiles/files/46522956824.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/vcfmupamebt6fjmmh8vt6pge56/wamaxitoxo.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/17950977114.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dcff988ae4---sosusutowolaj.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e640.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE640	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE52	19080 bytes
SHA-256: `1f3555883e2628066f44e8d315a4b3c0dbee88bb918552b986faf7e89542396e`
`font_02_sfnt_off00013014.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13014	10492 bytes
SHA-256: `e2c710de01848fc334cd521e6896a935da47303cdb95db8102501d988d615823`

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