Malicious PDF — malware analysis report

Static analysis result for SHA-256 471031d82ea4c270…

MALICIOUS

PDF

188.0 KB Created: 2021-09-04 05:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24341150fe0c0dfd55be4eda410a4352 SHA-1: 274f35d68fbe0708fb18f9619a3210562a77766f SHA-256: 471031d82ea4c270197896fbf0b46e4e82d57d88fc1cfb06d52e082ca50ad5ec
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary attack pattern involves tricking users into clicking links within the document, which likely leads to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nacyc.jp/Upload/file/72012508301.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16085511f83f9a---56365769170.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/50252954913.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/68689889151.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/moxeluvupukelalitepeketof.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4960780f1---50230080283.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f740df89f---61763552526.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4b5cabf8---nedevowewutebesinirubona.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/66594064549.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8ab0182---gudomofifa.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/wifajuguxopar.pdfIn PDF document text
    • http://cssh.es/img/file/robet.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/23643672728.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/bitusexodatef.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/82051246985.pdfIn PDF document text
    • https://ebooksweb.net/files/file/26078047975.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2e656af9b---61212433003.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/zufijanabu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/96856774383.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/pabitibubikow.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/befujoti.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jhfiuaad0j85u6vvlhvb6sjn1m/kinasale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=telangana+outline+map+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_off000281f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x281F1 18760 bytes
SHA-256: b5d30a484014dc1598f6af47cac3ed1f72b13376584d4d6e446848bab4bc596e
font_01_sfnt_off0002b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B167 10636 bytes
SHA-256: 6176f04b05e34d0fd2fe82550f4a6fd7501bec12ce7214a8618e07f2a6df3bdf
font_02_sfnt_off0002c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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