Malicious PDF — malware analysis report

Static analysis result for SHA-256 0963588eabd440cd…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 19:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e74c8d639a5402b242778457fa18cbee SHA-1: 9ed29ccc6d619ffdefabab65a177d52c72318f08 SHA-256: 0963588eabd440cd038aeb816521882e3225ea0ba1b91f5dd58b7ad4fd655119
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cb481de249c---xejuzavu.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/33851448226.pdf
    • https://panificioilcavaliere.it/userfiles/files/97857212548.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e27b16e48df4ff4c99ddf92459634831/xekovobuwafadesuxoveki.pdf
    • https://alexandrapanayotou.com/web/images/static/file/68053925493.pdf
    • https://cochleartudaskozpont.hu/files/bujezalusilavixin.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vc6a62t314doq4lpfpp4r2mdck/75093361792.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nojurifamewof.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/db5b8799a6dc39136e9f66572cfb4ad5/buxafugepewin.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4d1cc8f---wiviminexoruwit.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/49405496164.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745285dec87---29006375013.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/alo97rv4eu1lo9turu0i5rk4m0/xuwunajabopituj.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c069e175db9eb00ce3dcf994ddbc5600/sijepuvekusuxez.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/da11d941db65534be2f857f4e4828bf9/zagekavinegigiduxujida.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a849a057306bb6ae663d8cff62f78c8f/10688423187.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/64483532169.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9df40d801---doroxipa.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/96422509554.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qhe7nt6ng6l5nrkm2ioi6qhfa5/75789684664.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ebe3f12ec267a01d38313a898e179744/65991237736.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e47f3c2839570802028ad95e4ffd8686/99570926082.pdf
    • http://guojingmall.com/userfiles/file///56873467990.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160781d62626ab---75106031143.pdf
    • http://chapelguild.com/images/usr/67964027477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oysters+on+half+shell+near+me
    • 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_off0001023f.bin
b6e0d618572e403540c0fa44ca454535f8c791a98ca0fcfdda501d4dff1f562c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10524 bytes
font_01_sfnt_off00011a0b.bin
3351a091e9dcd63d154f71b73985cbb228051430a4e559f68cbc3b7ff85417cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 17672 bytes
font_02_sfnt_off00014815.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 16792 bytes