Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac598ee8182a631f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 23:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2147fec15cc225ecc2588fbabaa6ceff SHA-1: 0725accb00a3f741d63b5fcf4a52442047a004f8 SHA-256: ac598ee8182a631f03fe9038de6ba57b20049dcacbbcabea318706947256dfdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fishtech.org/uploads/userfiles/file/file/49683787197.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/688b61e2dd71160ec7795bbeeb6e570a/gonej.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/8350919010.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/52903667155.pdf
    • http://ck-kutnahora.cz/gais/image/file/pevitusaginubasizub.pdf
    • https://mmagame.com/userfiles/file/47347782658.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/xebozasawemopipajuguvu.pdf
    • http://interiorconsignments.com/media/file/debakaziwazexolulirole.pdf
    • http://uptownherndon.com/uploads/files/rigofinojozuzigudomasir.pdf
    • https://listapp.in/ci/userfiles/files/pigimavitifajegejagoda.pdf
    • https://oferta.lt/i/File/bivinexepolerikudowoxapi.pdf
    • http://auswallendorf.de/userfiles/file/78737068027.pdf
    • http://www.zywawiara.pl/pliki/74533874803.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/jagegik.pdf
    • http://lex.tj/img/file/58391414663.pdf
    • https://jager-ig.tw/up_photo/file/19788546679.pdf
    • http://tehpromyar.ru/media/file/kikoniwatenuvegabemefi.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614879e263419---diwidisirovapigovo.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/widowatebokabibisopogis.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/sijukutitejejosafi.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/vavuju.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161418597b2dd4---56962256726.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=8+ball+pool+pool+pass+free+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_off0000db22.bin
9b0e102cedbfda3a19c5c51163ca4b2a7ffd741384ed978348daf21876a59a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 17852 bytes
font_01_sfnt_off000109dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16792 bytes
font_02_sfnt_off000121f4.bin
f58eed1353c0350db669074fcb9d41d69853017d04ae909ca81eb0267ed856fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 10636 bytes