Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4e441361525f6c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa590816157ba040248862ba91de0f75 SHA-1: 705925419fa7ffe7c0848aa57226ef0ae392ab86 SHA-256: af4e441361525f6c4121daed0b0c3b5b9e7be3f304ec1bf7f6e4e6d8b66992f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to harmful content. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=redmi+note+7+pfgmixm+miui+12 PDF link annotation
    • https://sergiomauri.com/images/file/7719401575.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/92147435187.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/pijabidomugodipenagupuguf.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879979e2f1---lopunojamotovulexanobi.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/59628571678.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vowikazajuboxivuputedemo.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210909065808.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/pawimomow.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/vojul.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/19710580631.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kuduzax.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0ffe7e461efa3d5d66ef782f62ab4a72/jabofedunavo.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/46734116886.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/xadadajuvarifoloradewij.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/pisivinodogaf.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/25758863992.pdfIn PDF document text
    • http://elitacasa.it/images/file/tepafixuvu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/96084918947.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/944fa0840ca60adc52b1350fc2738bdf.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/39059b8a887b1126d507c33ef1b15b86/72291887594.pdfIn PDF document text
    • https://buyafranchise.org/files/files/11164338770.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dd742d87---vafufix.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/58856798503.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/86970268193.pdfIn PDF document text
    • http://epmachine.ru/d/files/73119365556.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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10836 bytes
SHA-256: f255e1729f2a8e10a47fbdb9de872f1c5720b3b56ed87f9a2aab88a6679e4dbd
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 21312 bytes
SHA-256: b25236df0ae0ec281376bc4437a7c930aa4b5dbc6d62f56dcb4c700213d2dc4b
font_02_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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