Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7a2bf345fb7f23…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e884f40323a8c3fa434a5fcf71494bbb SHA-1: 850aa97236025756160281fe39aeae4215847cc5 SHA-256: dd7a2bf345fb7f2359f24ecae722f7dd03cba9425603e059abda9bb5f030fad0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=transfer+files+from+android+to+pc+wifi PDF link annotation
    • http://bebaldebaran.eu/userfiles/files/62508961155.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/zavexoguwomurowidofun.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/bevuvedoxezixi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5b285b1a---zoduvajokebuxozujupofat.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rejugurenidixuzegojanise.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/85036224754.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/ditaki.pdfIn PDF document text
    • http://theurbanthinktank.com/files/36307154695.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32790766087.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/37196160407.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/36037524357.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091014044432.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/xuguvubawunazaliwogipan.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/l9fiveud8uc17cd1mv1l54kn8d/61761205773.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/5192013476.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rokiv.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jusizimu.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/lijasimuderenivijutak.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130bda051fae---50718048110.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/44811740451.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/exusizop.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040902277714.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vufukudixatekiwodowevi.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/feparudemogo.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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 17512 bytes
SHA-256: e86a3d21b05218a0d813f2efa21f2f28f8428729efe2713cca66c91b5615d01f
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10832 bytes
SHA-256: c366b6ee0a0f22fa464edc1e90d34630bcc8d4aea4b57e00cf3391fc58b3e050
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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