Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c93d3355372c05…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 21:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77198c9d998ce42a4155ebf4d77cf0fd SHA-1: d386fc4dc759f082c4c40c545df46a86836ea3d8 SHA-256: d9c93d3355372c055cac4d16a4e64c031fe58066a73859bfba757f6300138e42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bdsps.org/slbdavbatala/userfiles/file/wivusaxiz.pdf In PDF document text
    • https://tycoonmarine.com/userfiles/files/jalodugapomeguzu.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/29026308758.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c2b1a1e831b5b2a9a04f3d7c17a773be/54807784027.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/fujol.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/428773690.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vkrutgmp9o2g9b98fe5t5l9l0v/41760798233.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65361121828.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c88570c041f---86777341725.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/loxibokixujuzuwaj.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/23982020184.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f149e97a---tesejopawi.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/22204716735.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d7fe3bed---bogulixuzowul.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/naviwutef.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/bivatu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ct3866n9dht0bbab982d20pent/ruwarod.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/tudopokofugamoxak.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105c1feea908---sevulinuxinajakopove.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/65722435086.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/govolepubefobetitenobefe.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/35584003042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=delhi+metro+map+updated+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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10592 bytes
SHA-256: 701711c4c4bb109bd490dd6a15c54bc0c6301fa7955eb545570ebdaea6730d63
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17404 bytes
SHA-256: db2425dcba0b5b7085d776382fc7cd37ce37a2051adabb85d0ca353be56be2bf

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