Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e91ae97e45ff2ab…

MALICIOUS

PDF

82.6 KB Created: 2021-07-13 02:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9faf272bb1cd90917e52b7e4abfbfd1 SHA-1: 64ec025aa5f1fead14806c80c4c6ca98061221a5 SHA-256: 9e91ae97e45ff2abab7521655b4c66948a2d7a032f0c238d1495f7560cb45a26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3kovd47nqjifadnnjrhenfma0v/mipekubabix.pdf In PDF document text
    • https://aksusu.com/upload/files/riledab.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/75957737727.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bakaropuxikolovomotefov.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/deefb16fe24ba9bcc3b4a922c49648c9/rufaronubefap.pdfIn PDF document text
    • http://scro.ru/pic/file/16957170208.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/96136792978.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/iartilpasclu09jh4nnd6coegg/72345041950.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rulemepi.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/66126738685.pdfIn PDF document text
    • https://t2sc.me/userfiles/nelefaluxomevo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tawipunumawel.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b7225362---92441524586.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/23987220883.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763d5cbfce2---kametiluwidekikorebam.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db7b60958b9---98120207259.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a4712b7b6188964a4c2f3dd869e743bd/83438344254.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b421e094e9---91372145295.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jipezaponoje.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42414ad3f---98071742011.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c1cd885f9464dfe5abc5d450e1dce925/bovedilifu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/25362781530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=as+4+lettersPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/42449623644.pdfIn PDF document text
    • 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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 17200 bytes
SHA-256: cc2fe120eee4f344d9167df634b6d2b3b2e6605fbbd7b3ed01e2d37fcecc5103
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 9680 bytes
SHA-256: f86d35380814efab9016043f31af7e70eb70cd762e895f18f9e872013f5dbc08

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