Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b6f36bf89bf5fc…

MALICIOUS

PDF

90.6 KB Created: 2021-08-06 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64e52bb90c2a6568b11c82eb0efd5840 SHA-1: 9b9963ccf21654f625225d7f30b5303d073c9d19 SHA-256: 54b6f36bf89bf5fcfe1abb2f9c060a6d32b06da811e802acca56d7a8c67aaff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://humanlitech.com/files/files/77558503535.pdf In PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/nuzugapawi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/lolixixugikufadom.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68804402388.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5994a7b2---miradode.pdfIn PDF document text
    • https://landi-bg.com/images/file/fonexajowikitojuxidut.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/pixamowezasenapazarunono.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/27ca8bf38e4c018d24b26adc1b3df3ff/24935543552.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/jojasusunozuwerixokakure.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jewizojunujovujowitel.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ce39c39a---kabamatalinilo.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10617646600.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/5939430635.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/lafoze.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096538471152---70472945427.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c669de5a45d---8077194848.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b41388634---lupugakedebudas.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedufebodirurizew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074215fa2e85---81927522554.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd694d4885---7920204001.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b2ec3v60u6ru9naosm7urrc8on/26693966509.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/18869939668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+contact+cash+app+by+emailPDF 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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 17620 bytes
SHA-256: 8bdc3ca7e981aded64c8d650f1ee70acad75d6673c2191e5a7e9e2b68d49dc08
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 11008 bytes
SHA-256: b80c4167eaee1e26b770ec4ff02d4d0f0c96f4fa52e250b62ff2bd465f4a1f7a
font_02_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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