Malicious PDF — malware analysis report

Static analysis result for SHA-256 1129d40f80c0e831…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 05:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02a17648c9525a6e7734c92eb3c55ddf SHA-1: b40519a62df723e642ec0f45136d838f1664689f SHA-256: 1129d40f80c0e8316b04b2cbddc60015b089d0dc6243286a7d84f3e0a62504b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://onthespothousing.com/userfiles/file/87056461656.pdf
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901110259432120.pdf
    • http://offerparts.com/upload/files/lodewadoxajemelumaratuxup.pdf
    • http://centronegozi.com/public/89216219892.pdf
    • http://sanyosushiglendora.com/uploads/files/51880336265.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/13516784313.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d8027f5c---22746420281.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/motatomajavofiwir.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8bef0b6d341c7296901b93c6fbbf973b/mavakefizedime.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxexogalolawevopavozu.pdf
    • http://5lovestartw.com/CKEdit/upload/files/jifuwitonovejaze.pdf
    • https://khonggiansachhanoi.vn/uploads/files/34870234424.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dabed17c5---jukiwunotuji.pdf
    • https://pioneerlift.com/upfiles/editor/files/63755594429.pdf
    • https://bellcera.60km.com/upload/files/34446427374.pdf
    • http://csc0451.com/userfiles/file/20210912115859_oigcpo.pdf
    • http://azizavacanze.com/userfiles/files/nesezefofelafefivifojevo.pdf
    • http://lapawan15.com/shop/fck_file/file/4009830729.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/87608898586.pdf
    • http://effektfilm.de/files/file/rabunitupilisananomis.pdf
    • http://somsit.com/ckfinder/userfiles/files/74826451195.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/xokefilegojezam.pdf
    • https://fanaf.com/article_ressources/file/subibodabojinesomosuxu.pdf
    • https://geniodelweb.com/file/24085963691.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+type+letters+in+dial+pad+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06d.bin
1922ac284190b4c298efa0ec3a5d205a1121e7f7bfa888408fc570b1630b0ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 17944 bytes
font_01_sfnt_off0000ef92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
font_02_sfnt_off000107a9.bin
0bd89c67863e8eefd3b997c0b533ab1385d5d1148eb143ded50fa20e7ddebf02
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10576 bytes