Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff25573d4d8b7595…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 07:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13808569d6d3148a38d428aa70a6d742 SHA-1: f83c2d5600ae74030adc4301dec1d42e149a4237 SHA-256: ff25573d4d8b759569ce9a022d70e53286753f2e745be4de0f61f516be379124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of external URIs and link farms suggests the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=definition+of+anxiety+in+psychology+pdf PDF link annotation
    • https://mpksieradz.pl/upload/file/72975968575.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6ba03645---71832888239.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32302422340.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nanixevif.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vqbp5os9vhepkgj8obr9r4qh05/xikegalazugobitorife.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/xilebopolivegizukuvenov.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109051801026829.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/maxaribunejozekeluj.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16118102ae0f10---42974935069.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00f291a59---jafixokadumijen.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/66060057137.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/11924795292.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/sewewutipos.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/xomolevikaloxupetofobiz.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210722155929550.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/maxatoxo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e45a31571b688885a629646508ce1c8a/sojimofalafaze.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vajojefem.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/zebudugimisi.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/pisigazumixemufuneg.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/14771487067.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ribopaduvaxam.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/29234612072.pdfIn PDF document text
    • 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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 17848 bytes
SHA-256: ecbac73a22864411cbf236c0f94b946b3b5d35e2f462fa28174de3ff5e0bbb6b
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 11016 bytes
SHA-256: 47be533769e335e2f4ecb845823293dc5506ed292f930e9206a1ed66e40cf464
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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