Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8b2e28d4bd7f2b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 13:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4920b09818d65667cc48ca651c711ed SHA-1: 21ec76ccf044c5ce13a1f2aa905e74b37cb65375 SHA-256: 2f8b2e28d4bd7f2bef655fbeb9facd2989e1fd544af8b67725a67abc29de0eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=airdroid+personal+web PDF link annotation
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904205309622042.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/1728003938.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/20376457025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16e68b8da---rolemojibek.pdfIn PDF document text
    • https://blokhol.com/upload/files/nefelijumewepunelukabol.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jobiki.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/37630003537.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa0a43625---96578095137.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/88102117143.pdfIn PDF document text
    • http://lobi.md/userfiles/file/75393463160.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kuwelab.pdfIn PDF document text
    • https://diphong.com/uploads/80133049259.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/rixufikaxulimu.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/sonodolixo.pdfIn PDF document text
    • http://373113.linker.tw/files/bejepedoluwazume.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/747078506.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_162423.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40328887710.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/34887266854.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817b3261b7---vizasidejufopupa.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/33060076457.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/11715469419.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/18500080675.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/surisobugefegu.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 18224 bytes
SHA-256: b0c45d33498adc460ab4d94324d8c77a76af2f6af8e69f0b530571e9a3e8dea7
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10492 bytes
SHA-256: 89b6282052bdfe064397d375b5fd68bed7de5133dfd71e18fdc32ba9ccf0dcc0

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