Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f55376b978a046…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 23:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47c867dfbb3b0e553c3da8ed259e80d0 SHA-1: beb27b37a84fa0840215681aa55258a98425dd97 SHA-256: a0f55376b978a04682c1a91e38830f40cc4f075fccfa07a54ddd972f563d16a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

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://laborke.ru/uplcv?utm_term=roald+dahl+sinhala+books+online+read PDF link annotation
    • http://bukvoznaika.ru/ckfinder/userfiles/files/dubogupamobetugitixuwime.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/lugezimixepi.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/gusuferezinutudi.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/murulagekup.pdfIn PDF document text
    • http://vpsystem.com/files/fck/54421325142.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/67194754850.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2892971549.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161443ce1593a2---donekiwirires.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • http://etnorom.hu/pictures/dugadowevuzun.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/94468906811.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/rivebuzepepogoni.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/6129522598.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/61837000267.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nuvlmjpd4smdmie5tnm3s9ls9v/43066848003.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cmu1d9k1fu56gmke8lmdts8vbd/nefevigagogukerefanef.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/27584340845.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/nemelutajefebuxizepitidat.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zivufi.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/waxebatekijezuzifewivige.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/46881325623.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/57ebccf5d86cd8600aeb0a497c9571c8/92001732066.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/mesupakegubevefigut.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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 17480 bytes
SHA-256: a95a465972c2d23599d34cc1071c92580fd6583c71459ecb12fdd0204bdd9cb4
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 10524 bytes
SHA-256: e9fd1545d5282535faacc82288746f5028ad7451188b51c5d1cf886a60fa6bb0
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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