Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a17cb3f4f9bf02…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 04:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc3a9f6ff18e4f3ebe01b9da3bd7bcd SHA-1: df8b76e1c5393d364041283ed3caa3e107f73e5c SHA-256: 29a17cb3f4f9bf02952e5d4b1863ec95dbad4e926848af6df2ae0635dc0742a1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=typography+definition+pdf PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610443817ccb3---bosodet.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/53883801649.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bace053e---55685007257.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/80566189625.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/86069481391.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d053204086---33297437905.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/dirufugemadesofiwidazimis.pdfIn PDF document text
    • http://exima.kr/userData/board/file/7757463476.pdfIn PDF document text
    • https://irrisyst.eu/files/file/37178724830.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210801235346.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zinijas.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/nogejuwu.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/pepudafosigovumij.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8qoqqqr46lub79nehct7o2f4uf/sedaxovuzaza.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/1850507519.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/19366147574.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0jdpsa23kur1mj3brcvpg462a0/43564807710.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083cdbf794af---jakewosa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/563d7e68f5a12b390c416ee1320b6be1/69518322992.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/75860877341.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/59909715296.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/76387511385.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wuwijad.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/beritumeruvetijixir.pdfIn PDF document text
    • 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10640 bytes
SHA-256: 9802cf6a284f4a6482c7ce7e8ba7777cb70f3bbc9f01f0a3f30f543c5982a6ba
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 17688 bytes
SHA-256: 467c708c33b620d91b6f404ac47d07355c6431df1d805f126d15429bca1958a3
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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