Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fe457b31ca4093…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 06:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e8de0ccbb34b00494ef78bfefdc015c SHA-1: dee851de6cf8c1d68820cc34fe082600bc6cd593 SHA-256: 35fe457b31ca409333da67f2d057cd7aab59414c2934601bb947cb8088c6c285
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://deltarealestate-eg.com/userfiles/file/muxaluwenipanujolubad.pdf In PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/31799284005.pdfIn PDF document text
    • http://lagrupacio.cat/file/rakilomag.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/vafuvazodidinumom.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zomitevigodanenelari.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/gemunuki.pdfIn PDF document text
    • https://cardolf.ro/files/84182732607.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/43994635087.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/lilovusajajisibil.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905191020712953.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341d08785fe---66880157902.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/daxedakisebaw.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/luruxuxozukowatigufo.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/93210848.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/54259865348.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16140924c3b33a---dupotutiv.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/64328568470.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/29630068258.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/guxigukegesejobujowuleti.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/3432976482.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/3156680935.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79f167e61---28052409996.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ce2794006a83bddeeca685747988b0d7/56387616643.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/31336846601.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/77508736824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2+player+unblocked+games+wtfPDF 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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 14976 bytes
SHA-256: 1e506d1c4c1653a4bda7566a3f63d86a979d96d94b592ef032a41f99764cc5ee
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 11428 bytes
SHA-256: ba5128eaefd4084866d6fefdd2071f1d453ee892499093b91fd3c3c62cf54d6a
font_02_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1