Malicious PDF — malware analysis report

Static analysis result for SHA-256 920af262da67a34a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 10:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ddea1054e31e200621604a40a2ac2e8 SHA-1: 4dc362edcc563c9d52cb80da010489fedcf1187c SHA-256: 920af262da67a34a7340489cbfdea92da00745813a05540a8b78ef19289ac688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://princeton1959.com/clients/863834/File/13751365793.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b4d71c40b6e47a27ba45056944ffff31/6034190310.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/90380171988.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60597771768.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/figolezus.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xapoxedivovosuvi.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tizeradusulaminolu.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/36387282993.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3283e40c---62346234048.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/09461af42668237775494ce4ad362f7d/1648579315.pdfIn PDF document text
    • http://terminsk.by/pics/files/4120771268.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/1156427822.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/46045502218.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/31612748283.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/8439247233.pdfIn PDF document text
    • http://feast.to/upd_file/68517799587.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ef9f231c58b5a243bcb14adfedecfbc/50622642592.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/75860572890.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zirigutesefuxegutadi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718fe3336b0---vagijeminikixabaki.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/posaxijidaduwowepijowu.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/nuwivibegusudelinexev.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/9739986837.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/zobivetosexovawojuzel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=data+mining+techniques+third+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 11268 bytes
SHA-256: 0bf655670b6800180ac54857014906ef0dbf0561f8f54486ae3f2642fdb46d5f
font_01_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 18808 bytes
SHA-256: 2a81f4fedc4355b0a7a290ff591b2db54ee8c799a7a76a98654081fe142df524
font_02_sfnt_off00013fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1