Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d32aaded362928…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 13:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6102646d356eca4e827958e534c150c1 SHA-1: 134fd15fab7c5da93cb8b916ad07a6f721d2a568 SHA-256: e7d32aaded3629286c6922ec36da6cf3b4a0db17cf46c34be6f9f161220f142b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. While no scripts were directly extracted, the presence of PDF link farm heuristics and the overall malicious classification indicate an intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 http://andlupa.com/userfiles/file/48829945204.pdf
    • http://inventory-acepipe.com/images/uploads/files/sapoxubovur.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118a3f6a63d5---texuvekaso.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e7cd27a8---zigizotapa.pdf
    • http://www.pics4us.de/userfiles/file/vetex.pdf
    • https://daaeportrett.no/upload/file/patiguk.pdf
    • http://maychamsocda.vn/images/userfiles/file/misovovemeriteridalin.pdf
    • https://bikeid.net/ckfinder/userfiles/files/sitamofuzaledetivejebi.pdf
    • http://asja-doll.ru/userfiles/file/64163949697.pdf
    • https://seedomoretravel.com/files/files/vejememonetuvomibotu.pdf
    • http://agendaalzheimer.org/files/galeria/files/putitusijibejodeputilumi.pdf
    • http://birzebbugastpetersfc.com/files/file/5428298442.pdf
    • http://aaaexpressac.com/userfiles/file/bufafubozewuzo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/brqe8cqgv2v7emm9g7k4tdd6k4/xuzojalituxozutilafu.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/15b9e81c2acb54b53e6d13c616117ca5/23628648414.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4435ee70a---73931385267.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/41579902730.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/33656519507.pdf
    • http://asavn.vn/uploads/userfiles/files/toxefewasi.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1256cddac---50641235458.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b27e24be6c0992d5a769facc6c4a813a/matevonukimirefasivazoj.pdf
    • http://fandimnarodaku.cz/upload/file/lipukuvuwonobowokegaro.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/nosuzavi.pdf
    • http://m3hotels.com/userfiles/file/vivimisudidobakito.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a599712d69e0e1368ecfa361a3fe6c2b/xefapovizober.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/dumemexukanimerap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=us+dollar+to+philippine+peso+today
    • 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_off0000ccd2.bin
2c1161a3198a2b8bb11993dc7fd2a64041412af33ca598db76b0eac1c9dd3832
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 18468 bytes
font_01_sfnt_off0000fce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
font_02_sfnt_off000114fd.bin
1d38dc28f95b3820462e26a4623e9f30e48e5f24689fb5aa807fb0f18ba3a4f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10612 bytes