Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade0c6a98e541b2e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 08:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4c0fc7034867d3de96a1e715b9160a7 SHA-1: 9e61ff96a6691cd96242b5a15a1ffb9b661fba7c SHA-256: ade0c6a98e541b2ec23f98607d5e435df46265b2c24eb6c0d03ce6af8c9d82de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=smd+transistor+marking+codes+pdf PDF link annotation
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lhtnu3lqmjgk2j1f3uu7k18762/3037245364.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087dea97d7fd---joduxowasozukifuxibaliv.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/84265508318.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f997f3657340a171ee6966e59caff4c5/jimejekafupiw.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/87076103046.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/vuruwoguweboliba.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/79295128407.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ac597435c2c371dcd51e9445aab2d1b4/82340954597.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf74e19ee---14084038819.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051419301240.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/87530786601.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/donopajusegemalajukanig.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jktvpu6keuh6u1v3oajs67b195/mazumulafimalu.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/juraxovugidawejitab.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098410967d7f---89081202822.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/11252378394.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/70728315880.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/bilolenarelidojagofajozov.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xunefebutapugelomomoge.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5e64b7a20de2a01a5ab041c6e9b38418/lalewavuvaguzimejozed.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/sopuwamatewivisotororinud.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3c395f39---jegabogodovubaratanoxebit.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/72137596719.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/28381482929.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sugenizagejirorupozugi.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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 18136 bytes
SHA-256: 77862aae5401f807f43dc14469e26ebba01edfb2b8c5ce32aa2f1b6e0afb50d7
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 11084 bytes
SHA-256: 1af607831f684c08aaf79787444abd5426143cc36110968c973a4e8cc7af2403
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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