Malicious PDF — malware analysis report

Static analysis result for SHA-256 30551cccdb2d476b…

MALICIOUS

PDF

89.5 KB Created: 2021-09-22 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a2d85a9011805b6671f63763af7c485 SHA-1: 63fe27c7d60367f48d5c63f0b75f355af63b2d36 SHA-256: 30551cccdb2d476b88d9107ff0fef59e6e35402b947bbbd8299bfcb68babce02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=john+gasaway+miracles+on+the+hardwood PDF link annotation
    • https://pristineleather.com/userfiles/file/pezawuweziguj.pdfIn PDF document text
    • http://liily.jp/upload/file/20210911112008.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/waleresavazul.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/36281984384.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f06b04535624fe164df70f2de0641754/92235306229.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/19629462131.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/jokeragazazadiv.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/dexovozopirakabomemepux.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/5333353639.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r5835o54u6vsaha63kh724tv06/83564746006.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/77243854574.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/weguwizimorokapijuxuxu.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109120518155217.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/90794930090.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/21174072619.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/15215371811.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/57545631543.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/nazapokivu.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/volusofuvexolegiz.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/watirunid.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/64004983340.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/39806673800.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440538a8a42---44529939245.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_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 11008 bytes
SHA-256: 3a3f250d2acfd9a33b9ba1eded68c1fe4008c0fbb51a8e080c408b123d6370b1
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 18488 bytes
SHA-256: b2fbb13f3b2aa62961cb4791340205d644d8d908125e2786ff68be860e18d796
font_02_sfnt_off0001404d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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