Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35a084864e2e8a4…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 921ee59982a66ac467f642bcd8677bad SHA-1: bc67e3f171cbacfb49363f7fd19740c563c78e74 SHA-256: a35a084864e2e8a4d493fab00ac15d81fafe99e691c9246d980eefc655431958
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No specific script actions were clearly discernible due to potential obfuscation, but the overall structure points to a malicious downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=gta+5+download+for+android+mod+apk PDF link annotation
    • https://bd-sokolovska.eu/userfiles/file/tuwevumarokomekijas.pdfIn PDF document text
    • http://simonide.org/userfiles/file/92954014963.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/dadagisar.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/2599596755.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/53966750775.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b63f3f73---votomaraxobovo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/84918635615.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/95460e59e51f4d9d84b40c1df826effb/71548598864.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/suminexixegarowebava.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/11647515079.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1s05ffts8f4q2iif1052p47ob4/92613993026.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/de359d0e650a2dbbfc00d1d5eaebdeec/kanekijeniwozamuvuvexuje.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088b14cc2cab---giwidenejog.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3b46bb80---90465163474.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/lagowefumovi.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/u8u9h0nr2465r17fq1nofmsd5k/53439698779.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qjlrs12fv92bvibno24o3v3vvd/vagekisovanawofizije.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c5f9c4786---54493684317.pdfIn PDF document text
    • http://vejwun.cz/images/kerebafija.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079029fd695f---diwogojuziwasatuguna.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/u1m3bi8q79hg5c0egfhgb0noat/tagoguxaxefumaw.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01fc52ed19a6423045c22efd785afb5f/60873634545.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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 17556 bytes
SHA-256: cd0880b8707c7de3f3b49e6dfee81bdd50cb84d855790573acb293f90e1faa5d
font_02_sfnt_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 10708 bytes
SHA-256: 748033c7550a770f984ae90d9b2baae55766ec64ec617bc36f5348ab068d350a

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