Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9e46ea9b496c07…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 21:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c9cf8cccb69c0769f654b15409c1de4 SHA-1: 13e394b6ff693321d6a6e5b8848a6e0abede15f5 SHA-256: ce9e46ea9b496c07049a2cd35423e8f5d6fed0fabe2f4f8152dddb601b4e6ea4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure suggests a lure to download further malicious content, likely exploiting the user's trust in document links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://teplo76.ru/uploads/file/44854256111.pdf In PDF document text
    • http://temple.mo/userfiles/file/wowizukemizil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oe5riu7mv2sb2qk3j81ov0nud1/bonudorigabedetulekojotig.pdfIn PDF document text
    • http://chipgene.com/image/files/20210717_184340.pdfIn PDF document text
    • http://ipublicity.cz/data/file/12212335843.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bibetab.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd955d07b---sopena.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/radidimapokozokexilom.pdfIn PDF document text
    • https://mszukam.pl/dat//file/panekanogemedofa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f0de9b1ce03cd82a1521c6e79bbe1ac3/fopabimutalegudesoluviwu.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/80141728117.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/wojopizugeraver.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccd7b55942---sasekujobomovafuse.pdfIn PDF document text
    • http://yuhongzg.com/d/files/2544072089.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/35364750808.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/93864139012.pdfIn PDF document text
    • http://brenderup.ro/mm/file/sogowipimumefiwifujo.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a99ec09516c9133146a849f5dc67757/perove.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/pozumigudewevul.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/65911141136.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716cb46ae67---91710207860.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/24763853098.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070550e444d7---60111752843.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/regawaj.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/jiseguwowelewan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=indu+khurana+medical+physiology+pdf+downloadPDF 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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16648 bytes
SHA-256: 84004eae64389ea421fdcb16b27557fbd52ee26300db4d8928865c6a1e4bd6c6
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 11312 bytes
SHA-256: 3aa2f86afd24a4f01649e00ff1399cb9b52d0860560b2173c205d42c7b16350f

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