Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb591df634ae0115…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba61fdaf7a04b089fae6c81fd6fc2737 SHA-1: 5727c7130b72da8fecd060ef7c6accbb1cb42a9b SHA-256: cb591df634ae01157a8b54c2bc9c67ea482d4b514af6be701ed9841c5b2ac420
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The file is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by requesting a one-time code or MFA approval. Numerous external URLs are embedded, suggesting a phishing campaign or a mechanism to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://oniceh.ru/uplcv?utm_term=music+file+not+supported+android PDF link annotation
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/givadapitidobomiwizidatil.pdfIn PDF document text
    • http://moristas.com/userfiles/files/koluritip.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/24531495724.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zokukonadu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gukoxuxow.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/xizebes.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210911044913.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/sabijosubitotezaguvugow.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312a7939d7f---diral.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/rumonurataj.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/lavesafadudararugatud.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/59769251911.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94ee4c4c7---zajiteragul.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/todedujirub.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/319d07388811fdfa5cc25cabc4a2fcc1/fubusedabaroj.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109050538391365694psk6z.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fefowenepupedon.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/28630093500.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/kafadud.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/kixemala.pdfIn PDF document text
    • https://intersat.lv/files/file/67113637875.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/30202116263.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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 16740 bytes
SHA-256: b81a8e541c287a67b61a42662db588319ce382bf080214c9fe1c10f64e12355f
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10704 bytes
SHA-256: eff7b73f07a979b758ca13d230a880581d2e28f2e7c523a34398cda410fa23cc
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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