Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ccbc1f88201e7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6e0c092858d24bf6f6a82b854a51ad4 SHA-1: 9769aa7910b0f04483a06daf5ad2393ac0958213 SHA-256: 0f4ccbc1f88201e71805dabef01c05ee7f0a48cf711c2cf971318c8ac9461d39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kesifveotesi.com/files/dojajotijefowuwasu.pdf In PDF document text
    • http://bidmitt.com/img/files/file/42540583568.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136658003e42---36238260509.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/46652353014.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/68301808145.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe100c3e---nejuvu.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/narotaler.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c6515f7e4f28e3142dd0fe104e2bc172/49514309017.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/55981415672.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/54948663967.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/77691955370.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kowalisegajen.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139988a2af69---60348729020.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090507303773499.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/13202727155.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/siwimemenodejukibitido.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lawipoximuletisarib.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/99581055624.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/litabeliruzokepewivexi.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kaparavosunowafagoneve.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/monavekizofo.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/mozarutaw.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219211252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=google+play+books+offline+dictionaryPDF 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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 11180 bytes
SHA-256: 0661bcfede13e9bcbc6fe2f9aa948d9077459970e44de5bdc234fd787e3389ec
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 16468 bytes
SHA-256: 88258bc9eeeac5f9e6d69cf90c5855662ed0d7c3dfebdacbcc9e4f72967be86f

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