Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ceb58dad4f80be…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 07:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f90983835e390682f842330bca5d7c7 SHA-1: 531709cb357f7394c39c415d92e1be8495bd5a74 SHA-256: a9ceb58dad4f80be110edf25dff310f0d03be86d39ec8a4bdd1e9694e1e3dbe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The presence of these links suggests an attempt to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/mefiligekatabebusefetifaz.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ced61ad85---9845073510.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc77a527f8405d7e1500efa182e5671d/55633998497.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608653c3ee9bb---81620334429.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5311da83b---50012678567.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee342dae6a---golunizobiwe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6uohntt0psjfvucpa3g09d8vd7/64646294062.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90e01669b---vosusarujojosiva.pdfIn PDF document text
    • https://123natura.com/stockages/files/78471080948.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210623_72C5E57CAF760018.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b7c580c20fa31ba2ac013f6fa2940970/fisifig.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/susofifaxadivuromapula.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/mikefejeg.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/17681109792.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sutasetituzax.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/92163250008.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16085b414ca611---mojevetaserifib.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/sedotixexuzinewavuz.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609835cb1bdfb---67309199895.pdfIn PDF document text
    • http://chapelguild.com/images/usr/11802153448.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072d573b21a2---3039291107.pdfIn PDF document text
    • http://iwishop.hu/file/vipuzekotinute.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/93554498404.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nfp7ibngg7qm8hnlhm1k3gko5u/fekerududaxafenugap.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///37064661976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=good+night+may+all+your+dreams+come+truePDF 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_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 11068 bytes
SHA-256: 4dbefeebe79488bea838415719d987b8fa72f56a56d42d88a02e57d7c4435751
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 16152 bytes
SHA-256: 4e64e7ab2d54d107241a9b53a822f0d505da1dcf8306d05fdf250df780943b9a
font_02_sfnt_off0001351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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