Malicious PDF — malware analysis report

Static analysis result for SHA-256 026e5cfb06e7e9fd…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c87dfff30ba808551bccee8ccdcbd93d SHA-1: e824707c6c6a45e3c6709d64213cf9d2d8cb204b SHA-256: 026e5cfb06e7e9fda466bfdd54e701f2a5693b598fd4fd9c61a41f7d525c7a4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sesconbs.org.br/ckfinder/userfiles/files/37878503905.pdf In PDF document text
    • http://test-immo.com/file/vomadad.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sofedele.pdfIn PDF document text
    • http://unibox.lv/files/text/libijaxobig.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/laxibusaxasafuxunije.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/35526496095.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebca985109c3745f58dc63bdf60b24c2/lukigovi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • https://keongracun.org/contents/files/xaxavivamosabajuniwojege.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/44446595500.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/61876781726.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/41077769933.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rowipejajonelarep.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/38035286488.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fugilonud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zusoz.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/gipivupupunaxafevomase.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/10031523706.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c53e7ae4---nurukometowajux.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/70265881921.pdfIn PDF document text
    • http://arsvet.ru/img/upload/datadetotalawon.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/tikomakokubofupejo.pdfIn PDF document text
    • https://olterus.info/contents/files/99449274007.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161357328d0eb1---93709991159.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/41783531524.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totemidekevefegad.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/malomozipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+backup+files+before+factory+reset+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_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 11136 bytes
SHA-256: 5ca093e9611e8e0b0f9531ac6b0d092bee83e72c7ba5bba057d7f27e1f37c41c
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 17896 bytes
SHA-256: 8987c4699dd4221861394edb7ac9d8fb2ae8a079fd88c4d18e8a4bfc05388d3c

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