Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a96a760540be97…

MALICIOUS

PDF

124.0 KB Created: 2021-09-06 13:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b78d9deaba2d0c7825942689d79cb5d SHA-1: 795993fbb8ae601e870462401b5d0327cd930a68 SHA-256: a0a96a760540be9730d71f0f00272a756016f908627ec33aca93d71911683049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phishing lures. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://chcial.ru/uplcv?utm_term=abbyy+pdf+transformer+3.0+full+version+free+download+with+crack PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/24a1980c896395d581cd80c38ac8fbec/54242014910.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/57917107116.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3605560eb0771f1d7ac4be076e6fd334/72988113549.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/26873132636.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/47634418783.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/wikiwopibiwepilabamivi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/amem4ga4muin1jrlujevalsv94/bazejizepopesufu.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/72690974526.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0efa531371---pegefevosotexire.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rimepivoraxevimavanovebez.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5sd3h6uqutg8nmdbofqvsf308i/361433996.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/merajitakuwojopuxanaboba.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/kuxemepewetewajidefegezuz.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/74456616482.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a982611de---17447040597.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/gobopave.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/97690532669.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/807a2e3243d504fbe45e1a1a1b67af48/998378032.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608945dfb370f---joluxijivip.pdfIn PDF document text
    • https://goodline.by/userfiles/file/kedomanapevomarizoruvi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f7d55f83---kubefilupobuvan.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/54793191941.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_off000173d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D3 11824 bytes
SHA-256: a0fffde738d21cbf06e402dd82ff81832d734ac4440adabefe792147c73bf4ec
font_01_sfnt_off00018fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E0 21740 bytes
SHA-256: ef94049c355194b9c4b66f19455f6b48a155b866594f40d18820e45900616a9f

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