Malicious PDF — malware analysis report

Static analysis result for SHA-256 901fa33934762b1e…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 020d2f54e237c757c93e36b06907b75f SHA-1: 684a30503c042426372b1d6638a97abe053793b3 SHA-256: 901fa33934762b1ed48cbc0cddf3db721955d2cf6f64d364e2dde5b7305d14a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f631ec9a---36258951494.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c1077ae1f699e973ee67ebc927f6a200/xomawirisewawip.pdf
    • https://soudurelauziere.com/upload/editor/file/51178532413.pdf
    • http://4seasonstours.in/userfiles/file/lagikaz.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6cvok9u8g0gdoocusda9vhcrt5/lerisonuzotuxepizaju.pdf
    • https://condominiovillage.com/userfiles/file/87091014326.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/10556179238.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b64e4d1cfefa12e2b0accf33716d863b/78503415595.pdf
    • http://proxima-design.cz/files/file/67309662776.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a218a20ac196fb14a5b8a6e5fa16b913/wapevakazopaze.pdf
    • http://vizesblokk.hu/files/file/48210138265.pdf
    • http://brainbond.ro/userfiles/file/wokojekajil.pdf
    • http://polymer-optix.de/userfiles/file/46035728684.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d1222ab82ee52f054101d1ef585dbeaf/gisejipobonizuw.pdf
    • http://xaydungphongphu.com/uploads/files/xuxipo.pdf
    • https://aspaeng.com/files/image/files/dawijevusebubodola.pdf
    • https://mumegram.com/userfiles/file/daruziduti.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089452c64f6a---74210590664.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8af85789deb74b73bdde9c9acb0dd55e/36990563551.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/070690fb1ffbae5f9f0ea071d08ba9a8/64358997514.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a694395d1df---27849200450.pdf
    • http://colorfulmedia.de/fotki/fotki/file/78929788909.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075010521277---36593093869.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=1st+puc+model+question+paper+english
    • 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_off0000dedb.bin
741f6ad5c5f97458c1b94f888f3f54220f404456c633e4bae83a4c7515637f17
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 17056 bytes
font_01_sfnt_off00010b2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
font_02_sfnt_off00012343.bin
1761427140d6b5d9d68928fb92d202aa8602f27f5eb44fe0609eb83923fa2a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 11164 bytes