Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec787551430c084b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 01:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79188587f1e6150d57c7319eb4a3054d SHA-1: e398639459a1eb71a21a875399605ddcf03023e9 SHA-256: ec787551430c084b6ded68dd11e67c2873eb03645f5e159f0e008974cde7ba6f
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 WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but confirming the file's nature as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chinajnbt.com/images/upload/File/20077054751.pdf In PDF document text
    • http://caerulumpharma.com/upload/files/movizovulizunof.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/78232912232.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/vamojozunekutarenovuxe.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/fotewitujofejisib.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/lezivalepopubu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e085eed4---1114826262.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/28886349572.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0bc10b45---12527799054.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/37674044778.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/clvj0e6huiaeb6egkbrf2kf5m7/57538743495.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c83a4994507948563e07143e2317ff46/pezuvipajubi.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/sufivafat.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61c75b1ee---bonalenofemasotuzuxara.pdfIn PDF document text
    • https://anfauglir.com/images/file/fufivimaw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f978a651---wejenibinolosavugibeva.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/wajotubixefareko.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/83144523781.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/72479578233.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09682f3d89---rolomum.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/pojewasutisunejixolexole.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/54387433349.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/mitejideriro.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/94522347415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=face+place+and+total+value+worksheetsPDF 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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 10840 bytes
SHA-256: 3c145bdd4e0edc48e9660c97fa1917a2f9e9665c56a1352334a503f00f8e79cd
font_01_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 16668 bytes
SHA-256: 367d97cff390a5536b4dad35e936bbe2292076837c9b90eca381f5ee45b3e66b
font_02_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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