Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb81de1baf7883a4…

MALICIOUS

PDF

77.6 KB Created: 2021-08-28 01:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09a12143ad363fb9c9eb754ddbb3da11 SHA-1: bfc81ae9b750a09885e765e636125070bf497ad0 SHA-256: eb81de1baf7883a4300be7c5f7395289e2b8a16bd881737f525a15bf31d34184
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, containing numerous links to external PDFs hosted on compromised websites. These links are likely used to distribute further malware or conduct phishing campaigns. The presence of a link farm on potentially compromised CMS upload directories suggests an attempt to leverage search engine results for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.huntsvillepr.com/files/files/8004515036.pdf In PDF document text
    • http://asustainable.com/global/file/58567986847.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/nj2cofm907t7o8p9ucisqjhgag/dimukenikowenuras.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bimipinamibu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/visegakokoji.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/8b5729938c10f6c3dadd6b40ae813465/jaxitonifazanuletu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/biliworo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d8b0222e6aeb100c9cffd9bd2c74b73e/52714793659.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/74325902573.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppppk56ihil38lvp80ji61a746/50311046858.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/musuv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b3c42d8aa941024b3323b7667c11bb89/gifagevazomikubekuge.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/18734678711.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d7eb89db---98746252870.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/posisapa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d7ad06d51---defim.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jduhfsutvv0040uraa591o6q67/42360613617.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/nunuwikimupatepidade.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nezudoruz.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/gegijijokaxodalelubup.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/fulewumirogegazevomi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/57851421685.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20024522621.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/31866691749.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/nusijuzopusafekerosulez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+gastly+evolutionsPDF 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_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 10444 bytes
SHA-256: 813f29efd5ec6b8ab2aa66aaebd760577f80039b7d5a8416c6b1dab4e6b670ac
font_02_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 19900 bytes
SHA-256: 3615e51ff7bd0535d63f64a315a013ee2ab755563b5a71aed78fd5d9deea4ccb