Malicious PDF — malware analysis report

Static analysis result for SHA-256 395652939e151aef…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 03:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c79d1ec77951390253563408366ef09 SHA-1: 2086646ef7955c0ea2613903e99e80efe7fab69e SHA-256: 395652939e151aef55d4ac628f5122b0212e08c3f30bc5492ee9aeae5ee20833
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which are associated with compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mobspace.xyz/web/img/podborky/files/9913298525.pdf In PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/72430750772.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kinilegoj.pdfIn PDF document text
    • http://3sdent.com/upload/files/pidozivamepujufifulat.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c7f271c---12929134928.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6587e8b1---tabigafalinuzujuwafobi.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/lanibamojijodorutune.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078914cb5792---zuxupadimuxijomutaditak.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b81cer3rmtgm2gjpuj6u6eikq7/44982736730.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nadesaturevuwopadaretu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa0963dc3f---bivinetateduviragaso.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c544bce5c---tituze.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vesodel.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/sijamelofukuwaxubamu.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/gomowewinufa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/vokox.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/wasamurisuwo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9541935d8---guwerav.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/67a9d192d7073a1deee6f788cac40d15/21967460997.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/gepuwugibad.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/85057719349.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-1/20210701225803102696.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16164ac206---wejiganojekotufonawa.pdfIn PDF document text
    • https://bloc-immo.com/images/manijoxatulexebixipip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+matem%C3%A1ticas+tercer+grado+volumen+2+del+maestroPDF 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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 17972 bytes
SHA-256: 0cb3785a186913b00bc2e9d049d85529d96fc9e621828b6aabc5df0263a093fb
font_01_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 11276 bytes
SHA-256: 6d96885ab3b62828ebaaa3b92168efa02f7b8d1923f45199d8c170b3ec643214
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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