Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a0c8f3fb95b2f…

MALICIOUS

PDF

95.7 KB Created: 2021-09-07 11:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8774a27b31c19f46660a3ffc781ea54 SHA-1: c5e40283ac0251001141ddfb3a682b0d6d84eb4c SHA-256: 4a0a0c8f3fb95b2fefba8e4a7b632e14f60919e58f042ff1256387e485f44873
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting it's used to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwrichmond.com/uploads/files/47968849781.pdf In PDF document text
    • http://cdkkck.com/uploadfile/file/20210615031917.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ka63u0ts8rhnbtvh9phtu617u3/dasanukogetam.pdfIn PDF document text
    • http://dalaichau.com/files/kudukijajin.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62624f31d---78563147748.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/49871615093.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/13626267371.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/7ncamsgg3apr1fr5g5cdepn287/37923030928.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f2d0ad8c---wujib.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/legedugaseji.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/takg8c318pjno36khkl4oqulg5/6784578165.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210629_204221.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b14c1303edb---nesorewume.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/28128818810.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/4185727223.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e687da9fef0---89915909844.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/28298813150.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/89779195409.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/43176163140.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tpd5j5cdf31n6tol008152hju7/91679152514.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/58522280588.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a0b3e593---dosexisezalumefo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/be05652a753fc0ca86a8e7d812424913/dikifisudurugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=neumonia+intrahospitalaria+pediatria+pdf+2017PDF 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_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 11184 bytes
SHA-256: 677b7a2f553b706a491913dfd71f044eaa8812dca3400fcbc7cba478d77681c3
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 19412 bytes
SHA-256: 860e9ec2cd3450be7c29f54222b04ce861b51da959bad1a0cb4950d7ade689e4

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