Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2a84fc6aeb26a1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 22:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65035ba4753490d00c4e4268357b126b SHA-1: 8f311055c4b8cc5b0a6dd97495a28d925b8a0514 SHA-256: ae2a84fc6aeb26a16b664c43ef7ac87dc97fdc11e3eaf7388ba13dfc1fc73149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=mod+apk+music PDF link annotation
    • http://bakefruit.com/uploads/files/202109090253381888.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/tiguzikebomesow.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/wozajimux.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905232136.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/2293952385.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wolatipirozimukuwil.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/98641701238.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/jinemogobaboluva.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kigekejoli.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/17268176450.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vatoguzowovinobebifozobo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613757fa7c970---31227294779.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/wemorurifufasunop.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210906090839.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ece8e4b50---gojulenojinemeziton.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/josuritututu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131944c3a549---60218862390.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xatidigotudi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zipikegeguxirizime.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gumativ.pdfIn PDF document text
    • http://epplast.com/files/file/gekevib.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/54733454822.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/1364978156.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/vabofudububer.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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 18948 bytes
SHA-256: 187bcd76f58edc947830ac01db4c4799c4c4ddc0f3cec2f63dbaf262447cfa3b
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 10380 bytes
SHA-256: b70b6ab35603037066eb837cdc18f215db7833af8f7712309ab1505ffd226fc3

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