Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c4689079bdb96d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 17:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ced23259b0e5df398e35d49f9c28a30f SHA-1: 59fdf80ddf03d30f61e4424d6d1b6cb0a1889356 SHA-256: 72c4689079bdb96d570f7c70d5f26a927bce9060bf932c2ea1eb3f58e06884c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://chung-pei.com/userfiles/file/vugat.pdf In PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/27988299155.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9m383lmopvvqonm3g7j5bf45l/25101666439.pdfIn PDF document text
    • http://sakem.org/userfiles/files/14861076628.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-27/20210727061931521131.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/nezir.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa5d173219---paropopoxazajepe.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16119381221cad---jotabisixodatosuruw.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/soxes.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/61583058352.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/78597397971.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kelifimodemalafajitixane.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160942892e99d5---50527088161.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fubixigopiwofi.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fezofuwupiwerewuvege.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/woxawefobetukokubozix.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9a1eee0a---xewulo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/527090cb683c6d08bbdcdc2df9d6c0b2/60118556744.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-24/20210524044800495431.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a892d600---24756845653.pdfIn PDF document text
    • http://debden.org/userfiles/file/64114089600.pdfIn PDF document text
    • http://calisnt.com/uploads/files/9287147118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+de+bienvenida+de+grupo+bimbo+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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 18312 bytes
SHA-256: 689ce8501d1f1f16658b84c9df5e0b5d1156a167d3ad39761dbc25ba4573f4ca
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 10876 bytes
SHA-256: e9f5e0a31520e21674130c5897b8c6d0785489c624552c8d8af4605fd8569b42

Open this report in the interactive analyzer, or submit your own file for analysis.