Malicious PDF — malware analysis report

Static analysis result for SHA-256 5888b0a6aabacedd…

MALICIOUS

PDF

90.7 KB Created: 2021-09-07 22:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7318752017862b76637f768c38c6290f SHA-1: e8288773655d6f8fd4debd7e705da49dd2a620d5 SHA-256: 5888b0a6aabacedd83fb220b755c7ad43d38c90ea0a70b16aeb67cbc32c1091a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

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 https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046481cf4af---7263996904.pdf In PDF document text
    • http://oreoltour.ru/sites/default/files/file/45904432214.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c9a1a2ef1310725e2b0f832c5590df54/52100105437.pdfIn PDF document text
    • http://apsons.eu/files/file/84207535594.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae772459a6---lumeluvametonomanivax.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pokjh7cuqua3v85t17k94ksf4r/21916235042.pdfIn PDF document text
    • https://rinducm1.com/contents//files/69331791318.pdfIn PDF document text
    • http://net-marketing.hu/images/files/fumurafenafunikasorokovu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984011da1df---97021123601.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/pudagolukemofimo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/55625066164.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/15511927421.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/zaxugixemijiroromokemo.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/65393972210.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/xagepo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f1c03c8a5e24388c3ea2d08d95e72a3f/bagabuvum.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd6a915225---mapazovatarevuzovaze.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/vebusadujefam.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210704_230119.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/43781431168.pdfIn PDF document text
    • http://hopkim.vn/upload/files/7246294814.pdfIn PDF document text
    • https://vientangluc.com/upload/files/12132981302.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/98581747197.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f215ec56388b62bf77f97dff9c3d7d32/37049782575.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/86235219306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=compress+pdf+adobe+acrobat+pro+2017PDF 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_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 17448 bytes
SHA-256: 6b49573109014bc694c182b421a266fdd216cf04c1de536c0965ebb7539bf167
font_01_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 11052 bytes
SHA-256: e4fc63c7933622b1af652088f5e5f10639863281a5e93127e868e59b4ea5f3c1

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