Malicious PDF — malware analysis report

Static analysis result for SHA-256 900c8e4514b25256…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 03:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6529978b0c508f65595163078f4fa7ee SHA-1: 8fa504fdeb51dd805d172ddf6a681c2505a78818 SHA-256: 900c8e4514b25256d508d0b116e7b915e2a5248c037e1b2299088e8e49deb275
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm or lure to download further payloads. The presence of a 'download button' heuristic further supports the phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc258f176b---kexudufavarulefurewer.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5pitjlh1aleqfo1dqmgl3dmvp/tiridasokipadunidugodiku.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v5lq2mqgg9l9fnl3gqbrelc17s/10145063676.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0401fdeecec304b63dc4ad028f287591/98942356402.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/lelepo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a4a1cc5e0e2624731c4cbbc748706178/tidaxojiles.pdf
    • http://plncse.hu/php_data/file/2044948584.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f2995e56d---nuposu.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/34f6311cd6b30eb56a867f4d645a8a36/89112243092.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a368ae4f52f14d81ee4d370868512d37/4210621558.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16091ea6268895---92695311316.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977f4a54f25---weritur.pdf
    • http://nova-auto.com/upload/79070428957.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/97c62cea8bbf922582485c4522b5b9f5/51812701637.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/10242964758.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/0c3406dc284c29912a1190e1b8a1d27e/zovijiva.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2o2dopre546e69qoba84u4q2hd/lupadesivotabigevum.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98e24c16fd8d1e84301fe15c5ffa84cb/wulafepom.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r45u7mnae48o261emjfkpkddt9/dopuvunalaseviganoke.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3121ce828c42ced815fd4c1fe49e8944/kemuxeselojesarolotawuwug.pdf
    • http://tokyoto.pl/UserFiles/file/kawaza.pdf
    • http://zonazero.es/userfiles/file/64771876676.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce143d23ae---18176526363.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=5.1+tamil+movies+download+2019
    • 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_off0000f9aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 16792 bytes
font_01_sfnt_off000111bc.bin
67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16988 bytes
font_02_sfnt_off00013e05.bin
a902c2d6b5b89c1237454a0ecb88ca354f404f778ab76000e3340f85c8c64941
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 11028 bytes