Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c763a4db070127…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 18:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d398acc8eadfda951f15694ec87de9d2 SHA-1: 9f50c35e12a43647038714e2375dc4c610dc36ca SHA-256: a0c763a4db070127ad5f7581bc54d5636e1a2ea526c62da18a5079c8c3f1fc09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

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://inwebjor.ru/uplcv?utm_term=best+apk+for+pc PDF link annotation
    • https://csn-alliance.com/data/files/57577345423.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433fea52be3---51776065981.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907181809.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/44180395728.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/jorazubuxopamirosoxolosug.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/62963973055.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/tabepagavowomenadoti.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/70069430539.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614013e9ea3eb---fixiweranawajelazog.pdfIn PDF document text
    • http://sptcrane.cn/d/files/77617862624.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/29917470772.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161342ee24c64a---33841090759.pdfIn PDF document text
    • http://dejede.com/userfiles/file/92682363845.pdfIn PDF document text
    • http://grotech.in/userfiles/file/79670800207.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wuvimizile.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/jegavalunif.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/savif.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/11163672710.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/67897084396.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tupuxako.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xaxidupigoselegurir.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/puriposakakag.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909125128_9ol69m.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9c160b1d19aea36c61c89e3b93472fd3/pedevaxa.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/ligajiwapesijofavoroguzor.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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 10376 bytes
SHA-256: b32c6bc46dae8f47220c04bf1bcbc2937e661b6daab7533f0b33d5ab67b45b1f
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 17864 bytes
SHA-256: 1969590a9863ccba2416200d16b34e8bff4de3bf2579fd2c3876d16d79312b92
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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