Malicious PDF — malware analysis report

Static analysis result for SHA-256 2225ee4c86833000…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 15:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab5a3e53d0df14270ceb5aae67b63eff SHA-1: c3cfe9a1505a049e9b8b86d3d5272dbe3984238f SHA-256: 2225ee4c8683300040a9d4c12f426ff9e24c1137effbdc84dc5a15bf41904fb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous PDF links on disposable hosting further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://aromamahabaleshwar.com/ckfinder/userfiles/files/kululurevidujekupinuxef.pdf In PDF document text
    • http://bortran.com/upload/image/file/20210728080506.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b29eb622---kenagogavozer.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/89374666863.pdfIn PDF document text
    • http://citra.cl/userfiles/file/xegodatojikopa.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/zemolalalotibebip.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/426190a313e82fc295c636da7f3eafc3/tekulafimamulafesutuma.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/99983787047.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/welozipajipovilewatawofim.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/23a487b025344bc514ddd1374d45ce21/fomovatudeju.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/xinikoduxumeru.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/75620005432.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/fopituvomanigaju.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609457fef0f1f---40492047216.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/15342613450.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fipidewavaderetawunar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842da28a34---wijaxafetixisokolexu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jsub4lui7t5v9a4v7oom8seibv/8319806568.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/givipuronajov.pdfIn PDF document text
    • http://odumakus.com/uploads/files/fuxiwakuvilapegufizurat.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ee3a42c42---97336178448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=systems+working+together+worksheetPDF 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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 17012 bytes
SHA-256: 7d72292d106175b456c626bd25a4c78f20889122e8dd568d02991746d4f482fd
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10716 bytes
SHA-256: 4f3501dc8ede010413fbcbb96c7b6897291d8bc28888c71ba0cb89781dc5bb9e
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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