Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dbf0971cface98…

MALICIOUS

PDF

130.7 KB Created: 2021-07-13 09:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba39e2ec12b3676dd1add10238290613 SHA-1: 2fe43923eca284e9118458f1f32dfe80fb3ab1bd SHA-256: e4dbf0971cface98ac23a2e79fd446c2ff2141b00888aa6d1fd1073f1443e597
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=when+does+daylight+savings+time+go+into+effect PDF link annotation
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1a73a0f3cfeca4054c945eda7831f46e/tokijilarefetadatap.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5565ea3e---27671506518.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/66768164217.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/gawaxo.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/gidisibipazerepukirewev.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/58528633429.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xatubeboxutitune.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd3cba312---gogabugijeninibudotivavok.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/650d10bf85b92ee5e5729a31485ed332/8154186999.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/bomupeziwalokidug.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/39892933799.pdfIn PDF document text
    • http://alkanboya.com/files/file///93927171955.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b2f56cd91b502e310b12f99fb984da99/wuretibijukoxamedajo.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/pewumubavona.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/gifikakevuwugaliruv.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/zojugutodenupuduk.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c8a82698---31799690684.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/88252554306.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ae4a9adeb9f6f1d3297b16dd34e2a424/muligunetonekebal.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/554b0dd1cdda5d606e91af98a8cf3690/93061021887.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94561897180.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/922795de739545bf4d90ee251a97d7e6/piburipolotozol.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/mikivoxalezoji.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_off000199fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199FC 19116 bytes
SHA-256: 5f8ff872ee5bb4a2ccf59d232962698dcac2d458d06a2ce82aa90cbdcdaf3efd
font_01_sfnt_off0001cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB78 10996 bytes
SHA-256: b4f4a4e19bd06b3341fcad3ad77b084d84db1d1edf986f731911b79de4df1f77
font_02_sfnt_off0001e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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