Malicious PDF — malware analysis report

Static analysis result for SHA-256 627aa4cea0e23968…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 05:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41a6fa6d590448b37afc5bdb230bb1a8 SHA-1: 6c33abac7d51166e048bca49e7960eccccaabf12 SHA-256: 627aa4cea0e23968bb343a287175e00511ba266a480a5b4aae5accc124160eb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, which are likely used to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://natalieshuff.com/uploads/file/bugasadid.pdf In PDF document text
    • http://kashima.cc/userfiles/file/tabosotivosogakik.pdfIn PDF document text
    • https://ultralloy.net/upload/files/50916390287.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/luxifasuwawiju.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613820fb527ff---62254248770.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/razopagudanujeguxat.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/fevemefenivedeposav.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/36d7740bf0be9a9706c1a7f32ed40d00/31571179983.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://calisnt.com/uploads/files/70541905894.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/47430785957.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/5841656217.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/jinusoxol.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/34749161626.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/feropoxosoretesu.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/96184195959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfb77f873---sogozuluw.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/54796235342.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109072142331711.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/98095736151.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/40479756393.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/78914558906.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jativivudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=maxwell+5+levels+of+leadership+pdfPDF link annotation
    • 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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 17576 bytes
SHA-256: 6e3f4f710eedfa051b8d64385a4a1456a74465623297e4672b71ce656a637385
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 10776 bytes
SHA-256: ce90394f50396fd9a23244ba6a2c68c76dbfe5faf134e2b99854e18211d19480

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