Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc880a5e18503d6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 02:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fbe9654b358458c472a6688e370d803 SHA-1: 6e0f2601bd2c756c6c26b4f69758236c17ba8905 SHA-256: 0dc880a5e18503d6de5ee285f52d745099adae9779f9a5c700067b8b42a2b1bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=free+internet+call+apk PDF link annotation
    • https://altinhediyeler.com/calisma2/files/uploads/29760427564.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/62469069823.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/46331604966.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/xexixenomuluwazavirido.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zanage.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/82652d22345270b7564fa52fbca70d1b/91985304559.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/7740865450.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gorabidizikewilobutip.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/649804181.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nodaralijulifil.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130703f00460---80504470412.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/vesobokomalupe.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/nojawogefakusewevunofor.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mologegexan.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/4455526551.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p0j98spbgrik8ktskj9adl7ad9/fijas.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/70077665091.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0e808e574ac56c030117f70ab880b853/82231456214.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wuruvobanamepag.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/gasevuxelikivoto.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/60896806511.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/37193296321.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/kcq12hq8a3cl81nna0qkvkm5vs/rinesid.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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10148 bytes
SHA-256: 1fb5de98f14d583c42ba484bd325487c09d19c72c79d1ab071412ad03fd539eb
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 18100 bytes
SHA-256: 211a011a0b38773fbc5d4569e61e36c44dd7cf61668a07b71eeee8845889a058