Malicious PDF — malware analysis report

Static analysis result for SHA-256 045dc964d1206369…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 00:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e0ff76d6d398dbcbbab494eec1612c9 SHA-1: a22fe059de2ce1dd89760a7d83e7b940c240f1a4 SHA-256: 045dc964d12063691d4ab5996349dfa3288099d1bf6e8eda7b654417d8c643d2
96 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external PDF files. Several of these URLs point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or engage in SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://servmed.net/userfiles/file/boxedinajevewowopo.pdf In PDF document text
    • http://tnshoppingbag.com/upfiles/file/12292763778.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e192810ee---42241387438.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zuruduwejuwixele.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/84243971151.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/23173626039.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146537216f79---rowagavobirogek.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109111247348377.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/47414355606.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/morixagabobezarole.pdfIn PDF document text
    • http://edusfera.pl/upload/file/50069014484.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/12606554611.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210910105635.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/6764028314.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/wizavizuwap.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6fdf04ba---kewajejefaxako.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/17541926150.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bimis.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/zilebuwewugovika.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/720nlkq7j34ouoo2cnol7l3j63/92458855629.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/kojijiwiwuxawena.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/17421796864.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9826h9qluubmvfmkv3jiqaum30/99891314775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=new+super+mario+bros+2+wii+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_off0000b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 10880 bytes
SHA-256: b5c17e6a4e600cfc71c2794521dd61d1cb8d4fac4e00cbb5ec9d75ec92eaccc5
font_01_sfnt_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16664 bytes
SHA-256: 3f412c928a35e6798c947a1192bf6fa747dc38cc18077c7e6ef307146887524b