Malicious PDF — malware analysis report

Static analysis result for SHA-256 417f90f977f4c428…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82816a2027f26bcccd34b1153d112657 SHA-1: 8605ea4616b5a4d2b96ce42d5585fb11fc197a65 SHA-256: 417f90f977f4c42862aee05d1d62f5261ae13ff053413e1fd59a69d2dad18cfc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure malicious destinations or leverage SEO techniques for distribution. The primary attack pattern appears to be a phishing or redirection scheme, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://reklama-v-sochi.com/ckfinder/userfiles/files/tinatamogewoluwom.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7dd4891ce5404af25670540e50173166/varamenolijugugadusoxemu.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/wagol.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d740613741bc4cbb551fd606c01b482d/vuvisugarinozoxel.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113fe350346a---lusafejavejupe.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/51899508907.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d57bf733---23042717843.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/62483814373.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/tosonujikofupogegugilinux.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/85699213437.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/badugugivebebomitukibap.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f875acc9ec---44205835870.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1tfj7cnnffm02f3udes3bgn5r3/kusixupazuzanepi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/25569431958.pdfIn PDF document text
    • https://servicepapik.ro/files/79258137427.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pejafipegevorawununol.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/zupupipotiwa.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/96025659814.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9905735866---tomafafaj.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/27018757793.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/weburomolotivojojexorej.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggb5m6rpi5u77e6h5e27ujnrq5/fetotafabukokifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=neuroanatomy+of+the+brain+pdfPDF 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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 10880 bytes
SHA-256: de12bd2f8d907834005ff15bb4e5e2e1b7321382a0b59e7c048e4bc7323e591a
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 18668 bytes
SHA-256: 9d45c72dc7bc622b15fe9b442baaa9f401393dfd389106dc5c0cbb34761971a7
font_02_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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