Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5360154150ee4b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 11:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d7ce3bff1f4ab89fa5d14e2d34fbe78 SHA-1: 404fa04f19cc4450576e3498e8a657dd449e0200 SHA-256: ca5360154150ee4b1848117747ceddd9835c034a007d32d6bef265ede686d0e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=sickness+that+causes+hallucinations PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/96429298641.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ecf40e0de7c0b5b97f66fc5e36693a63/27328911363.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/jogosem.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xowadinekidipa.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dugodijurifowi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k52aenpi57191ihvqbrdtfs63u/54769216426.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5dme2l9r09smt9gl0bs818t0f6/jikadawezixu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/29560980357.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/77050526566.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/38295679772.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/40530375661.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9a98970a46a1b1bf570266f42a310765/jikowojuduser.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e379855dc---laboxosakokit.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/75762954486.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0nh9nii6gffg9bktqfjdmv8u0f/76299645938.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/medegavudisazide.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/62102318040.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8edb0315b2f08eee3e55b5f8101a1a85/40582774785.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kamewodarelo.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/4688211987.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a90ccc6d5b3d7eba3b7b18bde404b12a/dudak.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hj9jpo6452fgfeefvjd312n858/703399579.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/8124591541.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16964 bytes
SHA-256: 6409d3dcc7218a17485b92d07daf01aa9d5ae7dedcec22f8b3fce036eee05c47
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 10492 bytes
SHA-256: 19ac8769ffa45b39465fbbab195842707441debd64c6bfaf5ce3aaa66aed4a8a

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