Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2bcba253505ed9…

MALICIOUS

PDF

112.0 KB Created: 2021-09-04 18:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df1ce1519b4600fe3eb79e2b1c8ccf0 SHA-1: 1bc239166c7ea002275ba7ec35506bd506741da5 SHA-256: ae2bcba253505ed977b566248b0fb8c9c3de256efa1bd42502cbd334bf45e6f7
176 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and raw IP addresses. These URLs are likely used to host phishing pages or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16093a70207df1---22908872891.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/4222071380.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b501e836276095111da9933308f584e6/zaberigul.pdf
    • http://hytechcommunications.com/userfiles/file/13832222859.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607badbda6240---99326644803.pdf
    • http://prociweb.hu/sites/files/file/ritonogitajabajerakazitob.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/sigavibosozikaretowasi.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4bb6a8b7e---95296735611.pdf
    • http://cathayred-csr.com/img-cathay/files/dokepovexoposogozelisuwu.pdf
    • http://emblem4home.com/UserFiles/Member/File/todogajozurekukul.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/dezobubilebofi.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1916ndfr8n6n6kqm01j6qcfc1m/61857736026.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/lodag.pdf
    • http://zhjpharm.com/upload/files/salanuxeratajozekun.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d893b97b74cfdb0c0771607779aff313/742036598.pdf
    • http://vimbark.sk/editor_uploads/files/95264785962.pdf
    • http://jubileejec.com/userfiles/files/vedodu.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0b42baab---xowojositubenanevajolite.pdf
    • http://mintaialuminum.com/d/files/30322831882.pdf
    • http://barcelonasixtytwo.com/userfiles/file/73875709434.pdf
    • http://geotersrl.it/file/vupobaxozokipu.pdf
    • https://aspaeng.com/files/image/files/manovobulumebolojune.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdaa1dc9a---silikalosimugumu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=psr-280+yamaha+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
font_01_sfnt_off00014dd2.bin
f8af3f6c742948dc3e6c437299e9712896b24d82fae3ccbf8968312ad8dc9f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD2 16368 bytes
font_02_sfnt_off00016460.bin
60340ec946dd091b04eb32dd0ab46f381f12cf93c30cd15b6abdef4f91747869
pdf-font-stream PDF embedded font (sfnt) at offset 0x16460 10632 bytes
font_03_sfnt_off00017c99.bin
84c15e74234ef841ce96ef17eb1786806915e19d1f684baece5b318acbdcdc9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C99 20748 bytes