Malicious PDF — malware analysis report

Static analysis result for SHA-256 729eae79e7b8af02…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 00:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b81a5434b3f38beb83c693d7f5727e82 SHA-1: aa0f612ceef08ca6b0483a818a7694f39c9f70c2 SHA-256: 729eae79e7b8af022f38bbcbea04ab68debf02158d118780b40997e9ea0e80e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nagymester.com/userfiles/file/nusegadakexejonusiz.pdf In PDF document text
    • http://xatrbio.com/userfiles/file/69978723351.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/9630628621.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cfq1cjm6a2vlg2sehif13eime1/fogekemolajunugedaseberut.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/32573595175.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/33309701587.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/56091908258.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/m52juh0qki5bvbosfm8287b852/wipajuxobexarelafotinedun.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5db550d6---32534627526.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/20973238259.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2dffc40af---dimowufuxuwit.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608755e34d82f---96954873609.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae7e152c---xinibisoxadab.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c470cb33ade---50144342829.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/kajekafopeduma.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da5c80063---96807602866.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/157ta42l5244b4jtn5h3jnnba9/36972027203.pdfIn PDF document text
    • https://ekransamara.ru/files/66755900975.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r4hvop7a1c94diur0hihal8uqe/40130900092.pdfIn PDF document text
    • http://wdnederland.nl/file/36691437716.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdb1d8ac3---67954441683.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/74293676290.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/61976087794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=investing+quick+start+guide+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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16988 bytes
SHA-256: 5f464ed871730a15867763f6acacf2f0949ab4f615a41430f6bf5bb4be011fd0
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 10984 bytes
SHA-256: d5e5e079c1b90f0425e52b1c1860926bab67a70a339decea8690bdb4d6bd43b2
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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