Malicious PDF — malware analysis report

Static analysis result for SHA-256 397587acaa4ca91e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 20:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6cb31b4e2f17916e9fa26ed849ec4590 SHA-1: a2c7ac63d18c05edf576181efb39466b7805c79d SHA-256: 397587acaa4ca91e6fcd51f7e3080bb69536fa5f3063dcdce04214e14fc23cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The presence of these links suggests an attempt at phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://immodraft.nrw/images/architekten_agentur_images_/file/rowapaxediv.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fl4ggl0ogeo3gmv5vurl5plujj/43434018304.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30631381797.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/44886927095.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/medetogexum.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160805360010b6---mepoxuvesavabe.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/74128311768.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/15f148d5feec4d68b14a00f545613028/49103485200.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e956870e8c---dabokipirurufugi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ven2ok6tftcj3jn22a9bctv7js/tadunuzisono.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/19579740765.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/vewusulomikoxot.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210523213527116.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/23408253475.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d03f3e6bc---53741386093.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/340341462.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/vaxugo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9a41365978---24678086735.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f46400b3c---sevomizatakalojuwidop.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/12137297059.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0e2d20ac0fb9aa5b78d68c23a64ff2af/46315244157.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/63595496093.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/52686511439.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4mb1o95sm1rr02evgpg4qejl3l/zadelobinixulalubezofok.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8373fabb2fae20bf93853bc54ac50a77/25403740596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=weaknesses+sample+answersPDF 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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10272 bytes
SHA-256: ce68d0fe8ae35c654c02d7504a5974189fc4d5a394eebbaad3aec01dbc4735ca
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 17280 bytes
SHA-256: 2b1ad76434d87838c73c0237a8e7d5e560ac922c955f6764203015b58d113a8c

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