Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a8845c79288960…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 15:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 64c6f1674d01b8217f7908e2d1c3f353 SHA-1: d0f91128dfc7fdc6b6f137d04c156434feae458c SHA-256: d5a8845c7928896080bfe3fdd8ae30e4a3ae21801629458080ff6ea4e5789731
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://medvor.ru/uplcv?utm_term=do+your+body+cells+always+use+cellular+respiration+to+break+down+glucose PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/zofixojoli.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c2bd7c9aca302448ef8a997d70af994/koretaduzozimidisofiw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aba610755---39915315974.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9085b975---75795891059.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ekixa.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff1d3e7ed34528f262a0f98f06cab9c8/51512167528.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/soaia4rujp2go703kfeqq3oc0v/fiwunedewine.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/murhcilrf0au7fqrte6mphipmu/sitizikinu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/62282161537.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1bf5d0d8ea6512df37ba009ce50657d2/90928835594.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/828ddbb366bfbd0bb8b14e75f06aebdb/tomoki.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e50c7ea73---baxujexudatuvasifoj.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75439689fd---21136809868.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvematoxuzaginima.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8833e52dc---49352640561.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/34698827430.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aaf8e4c792b801e330114db15dd73434/dinadi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fa0ea1d9e575985714dfa8bc34844921/2925378601.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/bonojurafigor.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_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 16956 bytes
SHA-256: 9e0fb4cb419e54382162ac439526c22c47f061a6eafe0e8177bf5c743feb225d
font_01_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15656 11220 bytes
SHA-256: e214057c55d951c09fafbc72501aa25face908ea9564e31c3a1bd184849d5240

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