Malicious PDF — malware analysis report

Static analysis result for SHA-256 326a3113cbe70c43…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 12:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4a41f49dcb4041a04948d4c8fa4fed SHA-1: a5a45e31275e58725e75f26402daaa732c9b6881 SHA-256: 326a3113cbe70c438b93f1461aab38c28e637bd95b8b3da5983c28f3429ee4fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm indicators and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://idevicesplus.nl/app/webroot/files/userfiles/files/vakuxadal.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec1a858cf---23098135920.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/51436748847.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5b1es0299jjaa8c5iha1nv3ce5/88230459794.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/51990190142.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/duwunipu.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zezogo.pdfIn PDF document text
    • http://hkacca.com/userfiles/30276908163.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e57e8afff---25256812217.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/75918009979.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/5117388614.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/64197958108.pdfIn PDF document text
    • http://laserinnsbruck.com/static/rivaludutaveb.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/86102558258.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/7807723827.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/23e52a478432a0f8d33cefa79e01016d/dipogexeji.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/15293072115.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/45563195623.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/44734061217.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/rugotuzefisoxepe.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/feraxabuxigin.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574beec269---57797779241.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/1207572298.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16141b31cd0f4b---kexakimavowexurukadig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=buy+itunes+movies+on+androidPDF 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10696 bytes
SHA-256: 4c9105834a19f0fcf789d589c11818f4b5a89cf336ac83987c5bc1f9609471f7
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 17672 bytes
SHA-256: 85c42f20294366853293c0de1f774f1db04f3f4cc3f828cb488a83572f14efb4
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1