Malicious PDF — malware analysis report

Static analysis result for SHA-256 830bc90ab1c06c89…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 01:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c734070d9e3cc02d817a0e5ab2bf8626 SHA-1: 2f787007f8f95d7af4708638e2f2f113b826a781 SHA-256: 830bc90ab1c06c896fc1e0db7611d5dfa991ce35a3bbcb2ea4a41a566d3386aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=free+fire+apk+1.50 PDF link annotation
    • https://fototipia.hu/files/files/papigopezedoru.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c626450067---42167729711.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/tofemibejiviwejilozur.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/83382887118.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/92112657125.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-6/20210906124519349019.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bisavam.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25948522494.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/89218804204.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/56976469126.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/96453630900.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210924055213514.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/44688645645.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/16868936086.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/fixuvubedagotonipuvone.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bfc83526---2103493856.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/joxov.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a85cc705a91bc42bc441a8e778154201/naridawo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lugemowabej.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/46653504413.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/moxuripudetudavopuvemofaw.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fozuzemulurum.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/90101693551.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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 15848 bytes
SHA-256: 769c7e0dc43b29e86c8ea5c7b3091aa5a00518b7b00fca989df46291dab907f1
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10260 bytes
SHA-256: 5f39d35f00ae1b4e74cfe9438fcb42ff4c5b5517e7d5b2493015881dee3148a6

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