Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97ef13d9bf0490c…

MALICIOUS

PDF

80.6 KB Created: 2021-08-17 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb3dce7cd375e9af9b413c89f88ee4ec SHA-1: 2c0a9949372734b572cc3fe23dbbc13677004d99 SHA-256: e97ef13d9bf0490c913dc7fffc7372f57adfe6eb3de45d81bb61bea857ec4cd2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=stanley+fatmax+powerit+1000a+air+compressor+not+working PDF link annotation
    • http://ats-dz.com/userfiles/file/pelefolitobagukazopa.pdfIn PDF document text
    • https://alutat.com/data/file/3344358357.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/66167606428.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/94830712441.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e2e706ed03194ca30a2b74a849ee5b40/57219191084.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/migutar.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/31459339546.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/27836578320.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/10331964638.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h1pj7hqealpg50v7ja0qp19kib/19361296990.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/15618534876.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/zorerupuzivawosud.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4267ba2dd---setogasajavod.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/bosunejala.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/34827949089.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/34498916218.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3fcca3a9---40516383912.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58153155165.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/71152444346.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7bae3d7591de338f48319b8dbfe7a98b/66901534736.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba02a66e68---82524971636.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/71432444003.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jawawoteses.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/vivewamimodenijiro.pdfIn PDF document text
    • http://spain-ex.com/images/blog//file/vugoxomepuroxuxo.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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 11464 bytes
SHA-256: e5273893b697e0ee6449ae7b18cf9a63fdbf80fde715316fa5d3ee4ebf91dc4b
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16820 bytes
SHA-256: 0602f844ce0bb0d0ba5dee03fb430845f40cf097b1bf88aa9758b8230618e401