Malicious PDF — malware analysis report

Static analysis result for SHA-256 252453ebffd7a193…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 09:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c8727e151d081621120de2acb8a12e8 SHA-1: 69bd757eba4e1af7112062e36fd84ed6ab273dc9 SHA-256: 252453ebffd7a19342ea6c9bb86585323b7275efb660e221b291f2e8db258b20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous links pointing to compromised CMS upload directories, suggesting it is used to distribute further malicious content or conduct phishing attacks. The ClamAV detection confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=al+fajr+al+hadeeth+user+manual PDF link annotation
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4f4f05066c6b383825c3fb9990c83f1/23558924572.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/eecd6f65fb3d0f7ad68296b8a39a4fe5/luwopitosoto.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/540550886.pdfIn PDF document text
    • https://asi-filter.pl/files/file/najepenoxuvugaxudus.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/16349255748.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/doponuwotowidaxoxe.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/19025325162.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zowelaxulevovaxodisiza.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/mipoxojelovogozadoruri.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056cc24fcf---18336292400.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/77572813333.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/53062959725.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4vog7d0uh9gvamftin6ghe9o5n/bewowakudavovejejow.pdfIn PDF document text
    • https://aokman-drive.com/d/files/78550546269.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/pikirowizosajun.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/funam.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f9a06897---38882738786.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a60021df54a6a923cd1c20a78537f011/78762527102.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/96835885646.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/vaxibegodutodopolokupupeb.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/16071983889.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/3719191698.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/siwavopotelijutazujuxafez.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 10620 bytes
SHA-256: a9756c85f8546f6d328f674835e47a264e44be46d54dfe74a65e434e10d093a7
font_01_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 16828 bytes
SHA-256: 828e6f7fde2eb4832ab1bfea9d071df48bcbfcc8a067b68645edf30f8d9f006c

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