Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd4ff4e139b15a0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a19caeadfdef426f2baa9f0023590dc SHA-1: b04afc3c37809177c0097b7a702b4db8bcb26cd5 SHA-256: fdd4ff4e139b15a04ab272cc1b4b0ea5895929940bd00cf6ecf4439b954907c9
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.supair-lux.hu/ckfinder/userfiles/files/90025673952.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3eb8db8b1009386dcfad62af9b1f2776/86430978196.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db58439beb2---43598256660.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a835830b412---14484443490.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/inn49ndtnuk4cs85kqa49p9ik1/56285119854.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/lolibuwugosu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/31568785983.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/duvunabaz.pdfIn PDF document text
    • http://artside.org/data/temp/file/26981557535.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/28006094720.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f4753dcc1e3a795efc57ce99daea2ea7/xekufamidonedatarisusuna.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd31e2cf11---40543064977.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/78141853581.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc28554949---68055906036.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/64797537653.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/emuaihm2ab06u1cbdq8vsoicks/zodujalajat.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/21081694080.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/91d4ee7c253e88a4f61800e41dac4c0e/dujinaso.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/85920580402.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3e426cc8---9048698894.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c3959c94ab5f14d1a4dda029fecdee1c/zojiwuto.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/pogorokurogabimemupore.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2001507d---vepabilitivepe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f5617eb6dea---vulazodunujijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kinetic+theory+of+gases+formulas+pdfPDF link annotation
    • 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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 11272 bytes
SHA-256: 0fc44646b3e2e2c02822711bec9823dacbdee5b3b2a3058595b734a2cc76abc7
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 17120 bytes
SHA-256: 1985c990f73e3a8dfbdf274b9987187f2e47ae4f3669262e9267f3316af4da58
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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