Malicious PDF — malware analysis report

Static analysis result for SHA-256 e807c4bc6d695ced…

MALICIOUS

PDF

80.9 KB Created: 2021-06-28 06:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 419a42be5f5fc6fde1937df28e4c070d SHA-1: decfc61857d1f8a59c91315dacc2450560f09a0c SHA-256: e807c4bc6d695cedc303442d2880505b41b83169adde34a58f666c0def539d25
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ade1ec361---72624678916.pdf
    • http://targhevaticane.it/userfiles/files/11845140545.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0336d7a7---vojiwuvirivafimepedefila.pdf
    • http://uforoi.com/app/webroot/uploads/files/jiramulerorumumegutopawa.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96c27661a---29834376125.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/942ed8c330d0fea011b6a0356117e61c/bixelimaluv.pdf
    • http://aklond.com/UploadFilesfile///2021062502490522.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cefccbc019daa0edb26a2d0bd3f70dd6/xefafesazosopowuxinimile.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a309fab963f3068b8cd5d6a3ce433ab9/zokujenamat.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad3fe44af5911a0445ec0e7e899ab93d/15217328005.pdf
    • http://www.srijonihealinghome.com/fckimages/file/12102287546.pdf
    • https://okazdedziecko.pl/_files/Media/file/94135596192.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/n272qk76fjdl0qscrr0kg8vari/xemibazoxon.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47936dc3c---vodelomirinonorate.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9449267ccb2d0e501b4278c0cb71d58e/94621609453.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/gadekumumewuwejivadube.pdf
    • https://kovosluzba-praha.cz/res/file/gititekebesotitamaxapi.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dk5buvp8inmgsim4tlfsigfndv/reralanapopiniluxasotovod.pdf
    • http://ccforum.kr/uploads/file/1622591085.pdf
    • https://accuratesearch.com/userfiles/file/87538285521.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/16518353059.pdf
    • https://gloriamus.org/Uploads/userfiles/files/78056612598.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/45os6rcpbc67pt14bjkbdkk5p7/47170309801.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=god+sends+his+angels+to+protect+you
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d930.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16792 bytes
font_01_sfnt_off0000f142.bin
47ab9b0cc3ca9215e08b59cf42b30aabfcd6840a7693bb427d2c34ab0727e91a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 16864 bytes
font_02_sfnt_off00011d11.bin
eea779147ad832f6e88b15c27bba60635c434fb2ef9c6218ba1d71c7cc371e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 11044 bytes