Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e1ab45f0ae4d3e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 15:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 698fa998d1d7ef88d9b7933d75af1236 SHA-1: 7e14f916936df579c8b0c98a3f1b3df8f8290cc8 SHA-256: a7e1ab45f0ae4d3ef3fe4f47552b320057668e55e6573282dcf6da82f33325f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external PDFs, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seventyfirstclassof69.com/clients/60772/File/kejepugupikobejo.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608002682337e---lofunoxuliwazinil.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc200a3ed---23601891584.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9baf81a329109976e29e89c4700ace17/xuderunemumuke.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb94b7ff5---wowopalejoganunugowetato.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/832d7a20a29695aab4daf42799917cf6/74647184408.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/84665675041.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099abc76db61---94209740350.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928f71ec1e9---pofanapiderilozigifirovi.pdf
    • https://cakenepal.com/userfiles/file/rogagamuzezefomovamuv.pdf
    • https://akproauto.net/nbloom/fckuploads/file/5676662495.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7nqmg6v487025idvqcrcvcu076/68682460919.pdf
    • https://karinbentum.nl/uploads/file/60289938524.pdf
    • http://rauvuonsach.net/images/uploads/files/71424329121.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/97290468818.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e56929b2---nunukaxokik.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e6e5a824---79480411979.pdf
    • https://noventa.cz/media/files/file/vasupixorigafepiv.pdf
    • http://andlupa.com/userfiles/file/83432354203.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/95c32391ff4c1769cd39034dc40d0579/pifegeju.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nnt5l563rn1m57trtje0r0ng73/wukala.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/fnqaff0l6unmvehnnm08t19aje/jutupukuravuvorunar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=our+environment+class+10+notes+pdf+download
    • 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_off0000f3d7.bin
3364fc630f925cb41eaddb766b04f42b0196929f0045ca8a3f29518ef2876a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16820 bytes
font_01_sfnt_off00012005.bin
9b1a29584190dbf8efd0d7c02ade4e5e736ffead5cff172e563495f3599047b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 11232 bytes
font_02_sfnt_off00013a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes