Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab26f1dafb149afc…

MALICIOUS

PDF

93.5 KB Created: 2021-08-14 12:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aaa9d472653f17526a91e6879432061c SHA-1: 5e433ff1f87d9dc875b57a22c279c4d3b17115a0 SHA-256: ab26f1dafb149afc2f153910ca01614e920ac819218552f16a37e5b9dc6c41f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/dugovexivokajajukejivu.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/22h8125rkhi0k1179jkijapt66/likatuta.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160723b3fa7a34---59165096341.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0644630001625727004.pdfIn PDF document text
    • http://www.520amis.com/upload/files/nigolimawidolomawewitotut.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabizej.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/36240314474.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/nifopozesurararuwiwuxa.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/358aacab4e018e62aeadae5914437cf9/49046274661.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608571d17213d---gefetidixixibaloto.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/jupepemopixitababolirebem.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210619235420573715220.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1av5bo7vot4ct9v2bd53494u9q/binepo.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/74271899107.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc1c7a06cdc3375ca325b77b96b93e/zurozegixiriwokigizesota.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210606061206471297.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/55205072160.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/kalok.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/telekubaze.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174d003d2---rutakuluxofekedexokasu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f3897ac191abc6d3af1945e3bbc04bd1/xudorevofejen.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/14718980834.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cea864e0f---10207473576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cambridge+ielts+4+test+3+reading+passage+1PDF 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_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11088 bytes
SHA-256: f56069cd2724c60b06db278f9f8e05d62cfecd6a6432fed3245884092fec89a9
font_01_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 18024 bytes
SHA-256: c1289e8e0cef22bb96351962ef7a0120058afba337570d2808237ccbc9de7f57
font_02_sfnt_off00014db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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