Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3175b4f7e61081…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 01:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eceeb9e859d98536ec722302f2947ea6 SHA-1: 80c968727da5c60aed134a6da1a5a1606c8249ad SHA-256: 9c3175b4f7e6108166ce71c92cd946eb1494c51c5b2e7638d5864acd18048bf3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the intent to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://kheops-so.fr/ckfinder/userfiles/files/difigawolelukinemifeni.pdf In PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/riduwiti.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/43714460433.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/83591409655.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/tevaxojosumujebe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138631b4048b---70811325138.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/mamasinenas.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fepezekobokevuwiriz.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/54490110634.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613155b191792---xikuku.pdfIn PDF document text
    • http://art-ball.net/files/file/lubasemimafifoji.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/moseworebun.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/g47fv2q0atcu0orm8v3bk8nkmj/nixumifekerikomenijogam.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/49146233160.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/budofudemuj.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d00cf0601---fafizusetiv.pdfIn PDF document text
    • http://wych123.com/upload/files/towevosiruxifexanuwun.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/56331467079.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e9a064a27da1efb056cab400f2355dd1/dobimotofiwero.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/boditalumojoxe.pdfIn PDF document text
    • http://ahknchem.com/upload/files/bixalabupakafefuvudadadem.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132870e632ef---49305724371.pdfIn PDF document text
    • http://deauville.ru/files/file/banegegija.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a860c342---kudokevuxu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///5791071593.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/67355539163.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/62625747547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fluid+mechanics+and+thermodynamics+of+turbomachinery+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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 17384 bytes
SHA-256: c3019509642500f65e3f4056775c106b626d1044cc8def82c46ee4b3e7482d61
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 11216 bytes
SHA-256: b00fb7221257db9bcf110ee478f2bc1affb71bc32887d2eb6d21042bae0b5ace

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