Malicious PDF — malware analysis report

Static analysis result for SHA-256 4613d53c0cc494ef…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 13:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0e5c0943dd7b5fa38ef02522a94145c SHA-1: 05201ae1ee458d412d8d024095fbfc1bc03f75c6 SHA-256: 4613d53c0cc494effaabeef49d03c10f50fa77c75a6bee1d6c06b683052c4b23
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://www.srijonihealinghome.com/fckimages/file/jowidatibumum.pdf In PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/wepasuwaputesebezulufik.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/jabawepobigufiwizudakun.pdfIn PDF document text
    • http://www.celso.org/download/mefukab.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supatebizu.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/gerifirasoduvu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5168a23e4ff08eb443cd2a87bf207102/dudofemapekenexod.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/nedufipume.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631966545450207080.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7267b16cc---dozajutadovi.pdfIn PDF document text
    • https://insp.biz/img/file/65232838953.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddc717f6c---45954031119.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/97181088123.pdfIn PDF document text
    • https://costarica4d.com/contents/files/6426641070.pdfIn PDF document text
    • https://foulardfotografando.it/file/74095574481.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/malilawozoliwalexukaje.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161467000e2ba6---titokijiwunafaxapoxajozuz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613510829d4e2---zusumofijutikupakumejeje.pdfIn PDF document text
    • http://asvpp.fr/pdf/85897562162.pdfIn PDF document text
    • http://nscenter.cn/upload/files/45411044900.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210904001106974.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/09d558addb9cb0d1a2522a41f8fe89d9/rujaxurubir.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/87916738495.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/kapomixinoxovuwipurorepaz.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/nexitonetapumunisedemini.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/80482155310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comment+debloquer+un+telephone+lg+androidPDF 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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 18312 bytes
SHA-256: 3169531b937adf146f09cf0ce08cde649a92b99f601de03407ada3a088cf6517
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 11088 bytes
SHA-256: f893ef2e38cd8d115cb1d18757f713d643e23acacd5eafc65d2bbaf52c759154
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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